Sims Laboratories Limbsaver! It is NOT hype. It is felt recoil reduction. I have a whole bunch of Limbsavers; one on every hard kicking long gun I own.
I have both the Backstop and Limbsaver. Can't tell the difference. Both make a difference in felt recoil. Backstop definitely is quality built but you have to decide if it's worth double in comparison to Limbsaver.
As much as I hate to admit it because I can't stand the guys YouTube content his pads are legit. I've installed 3 of the on Hnt26 chassis and they perform very well
All I can say is that they work well. I put on on my Tikka 30-06, which had a pretty hefty recoil and it tamed the recoil right down. Felt recoil is similar to my Model 70, 308. A bit pricey but they do work.