I've had it for over 3 years, and it has been very convenient for me. It has 2 heat levels. At the low level, it is already quite warm. At the high level, you need to be careful, IT BURNS! I found a way to lift the keyboard a bit higher, so it doesn't burn it (I haven't had any damage yet)... but the heat it produces is worth it.

No matter how many years pass, the edges (right and left) remain raised as seen in the photo! At first, it had a plastic smell, but that went away quickly. Over time, the design has developed some... thermal deformations, but they are only visible when I lift the keyboard.

My only complaint is that the mouse rubbing gradually wears down the surface. Recently, I noticed some peeling there, so it's probably time to replace it... but after 3 winters, with hours of daily use, it has long paid for itself.