Works great and makes my keyboard sound wonderful. The low price makes this an easy buy.
Overall, I like this plate foams a lot. The effect is a bit subtle but quite unique and noticeable. The sound is dampened quite a bit and the feel of the plate is stiffened. The foam also brings out cleaner notes from the switches and greatly reduces the chatter noise. Keystroke sounds extremely crisp & poppy. It works particularly well on loud tactile switches like the Holy Panda. On quieter switches like the Zealios, the foam provides a deeper and much muted sound. You might or might not like this. If you're looking for a quieter & stiffer board definitely give these a try. I would highly recommend these on Holy Pandas.
Here is a typing test of this foam on my XD75RE: https://www.youtube.com/watch?v=tHdoBuwZLbw