(Purchased for 60€) Just received the keyboard, and I have a few immediate comments.
Coming from a membrane keyboard, the keys have a very nice (quiet) sound and feel.
The lighting is excellent, with many functions and fully programmable (via software that needs to be downloaded), with each key able to be any color you want and the ability to save up to three profiles. It also has side lighting, but it is more limited (only has functions for rainbow and static colors).
The included Wrist Rest does NOT attach to the keyboard, it is made of leather and is good. It has plastic feet and does not move at all.
The keyboard is sturdy, quite heavy, the cable is braided and there are "holes" underneath to route it either from the sides (left or right) or from the center.
These are the comments for now, if anything comes up I will mention it here (I'm giving it 4 stars due to limited experience, but if it proves to be good, I will change it to 5).
1-month update: The keyboard remains as excellent as it was in the beginning. I really don't see any difference and no key has broken. Just a little caution: the keys are quite sensitive. Not to the point where you can't rest your fingers on them, but a little more than that and they get pressed, something I have practically gotten used to.
~3-month update: Everything remains the same.
~10-month update: The keyboard has remained excellent. The slight anxiety I had about a key breaking (like with Motospeed, etc.) seems, fortunately, to be unfounded. I think it ultimately deserves the 5th star, an excellent purchase! Now, if any issues arise, I will update.
2+ years update: Still excellent, the keyboard has not had a single serious issue. Occasionally, the "+/=" key gets stuck, but even that is rare. Also, the wrist rest has worn out a bit where my left wrist rests. Despite this, the keyboard remains superb to this day and has truly made me happy. I hope I didn't just get lucky with a good piece because it truly is exceptional.