I have had them for 2.5 years (I bought them for €93).
It is true that their plastic parts creak a little, but otherwise they have excellent build quality, with a metal (probably aluminum?) construction inside their plastic that makes them very durable.
So far, with very heavy use, they have not suffered any damage (so those who claim they broke them within 6 months simply throw them around like a ball).
I rarely extend the microphone, so I don't have an opinion on that, but so far it works fine.
They have excellent sound quality and moderate bass (which personally is ideal for me, as I use them for work, music, and gaming, for many hours every day).
They have excellent sound isolation both in their speakers (people around you can't hear what you're listening to) and in the microphone (I'm in meetings all day, and others near me can't be heard when I have the microphone on, unless they sit right next to me and speak loudly).
They are very comfortable (again, many hours every day).
They work wirelessly plug n play on PC and Playstation.
They have a huge range (I can join a meeting in my office and go outside to the balcony and continue talking normally).
After 2.5 years, their battery still lasts a very long time (I charge them every 2-3 days, using them for about 5 hours a day on typical days).
In case of damage, the cover of each earphone comes off easily (screwed by hand) and you have access inside the earphone for any repairs (I haven't needed it).
Overall, I have an excellent impression and, especially now that they have dropped to €75, I highly recommend them.
As for the negatives, I would say:
* They don't have a very "gaming" appearance (they have a more serious/discreet look)
* They only have one button (by default, a mute button), which of course you can program to do whatever you want (I have set it to pause music). I would like at least 1-2 more buttons ideally.
* The Logitech software is mediocre, but it does its job if you keep it updated.
* The headphones are quite bulky. Personally, it doesn't bother me at all, I also have a big head, but it may bother some people. They are definitely not meant to be worn lying down.