I still think if you use the pads, don't lock the rifle down, it's a great device. Especially for 3 shot zeroing.
I also just did some Googling and did not find anything definitive about damage. A lot of physics discussions, but nothing actual/factual. If you were really concerned, buy the $99 one, and take off the back butt plate and only use the rest (let the gun recoil into your shoulder).