The 1 star is way too much for this alarm... If there were -10 stars, I would give them without exaggeration, and let me explain:
Everything seemed perfect for this alarm kit, with a little familiarity with the instructions, it can be easily set up and its features are enviable even by more expensive systems.
I bought one of these alarm kits a year ago (it's still working for now)...
So, I bought a second kit for another space, so far so good.

The second kit started experiencing constant freezes after a few months...
At first, I thought "something happened" and I didn't want to judge it too quickly...
The freezes mainly occurred when the console completely froze, either in standby mode or in alarm mode, and the siren would go off!!
The only way to get it working again was to unmount it from the wall, open the back cover with a screw, and toggle the main switch...
Then, when you closed it again, it would work normally until the next freeze!!
Within a week, it had definitely frozen again!!

Up until this point, you could say, okay, you got a faulty product!
Well, things are not like that at all!!
I sent it back to the store for them to send it to the distributor, I received it back after about 2 weeks, and the distributor said there was no problem, even though I had sent them a video proof of the console FREEZING!!!
So, I got the same alarm kit back, insisted at the store to talk to the distributor, but they never gave me their contact information, they said they don't give it to customers. So, I didn't even know who the distributor was...

I put it back in the space, it froze again after half an hour!!!
This time, I sent 4 (FOUR) video proofs of it freezing. I waited for another 2 weeks for the inspection by the (secret) distributor, and they only replaced the console, not the accessories.
I put the alarm in the space, and within half an hour, it froze again...
What else do you want me to say??? The distributor and the alarm are garbage, plain and simple...

I shouldn't forget to mention that the radar detects a cat in the space, even though it's supposed to not "read" anything under 25 kilograms, unless I have a dog and I don't know it...

I will write an update if they refund me...
UPDATE: The company accepted the repeated faulty batches and issued me a refund

It is better after all to leave some things to the experts, we didn't know how to install it and it malfunctions... It's mediocre but now I gave money again and put a proper one from a store and I feel safe... Even if it cost me more.

For its price, it is definitely worth it. I have had it for a few days, it is quite easy to install and set up (I haven't found out yet if I can change the zones and choose which ones I want to activate, but it has the home setting that deactivates the motion sensor).
I had read about 3 "defects" that have been resolved.
1) They put a screw on the lid.
2) If they remove the alarm from the wall, it makes a noise.
3) Now you can easily find components and spare parts in Greek stores.

Overall, it is worth its money, but I don't know if it will cause any long-term problems

I have had it since it was released and it was No1. I encountered many problems, which I solved on my own because some secrets... they are not written in the manuals, nor do the installers tell you. The control panel batteries, as a reviewer also mentions, need to be replaced every 3 years... but... where will you find others... nowhere does it state what type of batteries the (external) siren takes, nor how many!!! The RFID tags get demagnetized and don't work properly, where will you find RFID tags??? Unfortunately, this alarm system does not have support, but I recognize that it is a cheap (back then) solution to feel semi-safe. Do you know that RFID tags can be programmed, and every time the owner who uses it enters, you receive a message, who entered your house? with their name, time, etc.? However, they don't tell you these things because they themselves don't know, they just brought a product and sell it without knowing its capabilities, if they knew them, maybe we couldn't afford it due to the cost!!! Now I am in search of a second external siren, and no one knows anything, but even those who know don't bother!!! My siren has not been working for a while, and everyone told me that the battery had probably died, so after finding a battery, I opened it and found out that the battery is fine, and in my search, I discovered that the buzzer (speaker) of the siren had actually burned out. In the end, I found the same thing from another device that I bought and had to break it in order to replace the one it had. The value of another device, 7€, a 12V siren. For those of you who have this alarm system, keep in mind that you don't have the best, just say that you have an alarm system at home. (and I'm speaking for myself) !!! :))

Very good. It was the alarm of the year. Everything is wireless and notifies you if it detects something on your phone. The operator is very easy to use for many years, I wouldn't change it for any other. The only thing that requires attention for those who have it is that the batteries of the central unit need to be changed after 2 to 3 years

Searching online, I didn't find many reviews! I bought it about 2 months ago and it has a very easy and quick installation, easy programming through the mobile application it provides (although there is a problem at least with mine that it had to be switched to English language, and that the entry/exit zone time does not correspond to the application when the pin is changed, so I have set all zones to 15 seconds). The negatives I have found so far are two construction errors: the first one is the placement of the power cable outlet of the control panel, which should have been directed to the side or bottom (and not from the top), and secondly, they should have put a screw on the battery compartment door for added security (they put screws in joke toys, but not in an alarm system). Other than that, it works correctly and has never triggered without reason!