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First of all, BCAAs do not do anything in terms of performance or muscle mass increase. There have been numerous studies in the last at least 6 years showing that in this aspect, BCAAs are just colored water with a nice taste. In fact, there were some studies showing that if you only take BCAAs without consuming the other essential amino acids of protein (either through food or through whey/casein/EAAs), it led to a slight decrease in muscle mass. So, for those of you who are considering taking BCAAs for this reason, it is better to take a whey/casein protein and drink it before/after training or during if your stomach can handle it.
Apart from that, according to some studies, BCAAs help in faster muscle recovery after intense workouts. In combination with the fact that this specific brand includes an electrolyte mix, it is a good choice for this reason in my opinion (and the raspberry flavor is great).
For those who say it has a chemical taste, of course, it has a chemical taste. If you drink tasteless BCAAs (and even worse, EAAs), you will want to dry out.
For those who say they feel a pump after drinking it, it is likely due to the citrulline included (although as a dose, it is relatively small, 550mg per scoop)

I have had the watch since 2010 and I wore it 24/7 (until 1 month ago when I got the new rangeman). The only thing that happened is that the strap broke after 8 years and I replaced it with a nato zulu strap (with the jays and kays adapters that you can find on ebay). I really wonder what use those few people who mention broken lugs made of it. Not a scratch on the screen, nothing.
Regarding the specs:
The compass is very easy to calibrate. You don't need to do it often. After a long time of not using it, I noticed minimal deviation (due to magnetic interference during that time).
As for the altimeter that some people complain about: This watch calculates altitude based on changes in barometric pressure. Don't expect it to be accurate every hour and moment. Its purpose is to set it correctly before climbing and start an ascent. If you want accuracy in altimeter, go for a smartwatch or the new rangeman that does it through GPS (as an option).
Okay, for waterproofing and resistance to mud, salt, etc., there's no need to say much. The watch can handle any conditions. I used to take it diving because I liked that it had a one-button start timer.
Regarding time synchronization via satellite: Various factors come into play, from whether you are in nature or in a city with tall buildings to the weather. Surely, don't expect it to automatically change time from daylight saving to standard time (and vice versa). I can't say for sure what affects it because I noticed that there were periods at my house where I almost daily saw that it had synchronized during the night (it displays a symbol above the time) and periods where it didn't synchronize. It doesn't have significant time losses (as an electronic watch), so I didn't care much. For those who are obsessed with synchronizing their watch daily, there is an application for Android called Jungans (there are probably others and similar ones for iOS) which emits the signal that the watch listens to for time synchronization through the mobile phone's speaker. So you go to manual synchronization, start synchronization from the app, place the watch near the speaker, and in about 30 seconds at most, it will synchronize. Otherwise, if you don't care about synchronizing often, I would recommend leaving the automatic synchronization on. With the sun we have in Greece, the battery won't be affected.
Needless to say, with the solar charging it has, the battery doesn't get drained at all. I have never seen the indicator go from H to M, not even in winter.
For the price it is sold in Greece, it's probably not worth it. I bought it in 2010 from abroad for 200 euros, so it's ridiculous to see it at 290 in Greece 10 years later. For 200 euros, I would say it's worth it.

Quite good and easy to use. Theoretically, it has a range of 100 meters in an open space. I tested it at a distance of 60 meters with two relatively thick walls in between, and it had a signal line. So its features are indeed as advertised. It has 4 settings for sound sensitivity and lights up with 3 indicators showing the sound intensity. You can also remotely adjust the parent unit, turn on the light, play a song, or even speak (I wonder if there is a baby who sleeps while you talk to them through a walkie talkie, but anyway). I have had it for about a month now, and it seems to be worth its money so far. It connects easily, is user-friendly, has plenty of functions and settings, and works with or without batteries (directly plugged into the socket). The only annoying thing is that it makes a sound when you turn off the parent unit (fortunately not when you turn it on). So if you are, for example, outside or on the balcony and then enter the house and close the device, you will hear a sound. Therefore, you have to do it before you enter. Not a big deal, but it really seems useless as a feature of the device.

For those wondering about the differences between the other models, here is a summary:

Philips Avent SCD731 has the same features as the SCD580.
Philips Avent SCD721 has the same features as the SCD570.
Philips Avent SCD711 has the same features as the SCD560.

The only thing that changes in these is the appearance and the fact that the SCD5XX series is mainly available in the US/UK, while in Greece, Philips only offers the 7XX series. The extras in the name with / (e.g., SCD731/52 and SCD731/26) are simply differences in batch and date. Otherwise, the functions are exactly the same, you can check it out. Don't fall for the American/English model, which is usually more expensive, thinking that it will do more things or be better.

In summary, the differences between the models from the simplest to the most complex are:

SCD506: The simplest model. It has a light, music, and the useless ECO MAX function (which basically means that the connection is only made when the baby cries. This means less radiation but also a longer delay to hear the cry, and I have doubts about how easily and quickly it will connect if you are far away).
SCD711/SCD560: The difference from the SCD506 is that this one has a temperature indicator and alarm (maximum/minimum). Theoretically, it has a range of 10 meters more in an open space than the SDC506 (the SCD506 says 300ft, the others say 330ft).
SCD721/SCD570: The difference from the SCD711/SCD560 is that this one has the option to notify you with vibration for temperature changes (while the SCD711/SCD560 only has sound). It also has a base for charging the parent unit, which, in my opinion, is useless because it just takes up space and instead of connecting the device to the charging cable, now you have a base that needs to be connected with a cable and you have to place the device on it to charge.
SCD731/SCD580: The difference from the SCD721/SCD570 is that this one has an extra option to project various patterns on the ceiling.

I hope I helped and saved you some money