Bought and tested, there is clear difference, although not up to my expectation. Maybe like 4-5c reduction on hotspot temp, 3c on core temp.

I butchered the installation, had a hard time trying to separate the plastic from the silicon layer and there was parts where I teared the silicon. Decided to just install it to see how it performs, it seems that it works quite alright.

I did look on the reviews, so far no one mentioned about degrading even going as far back as 1 year reviews. If it really is, then is still worth it.