I put them on all my pins now. I love the look and feel. They are slightly tighter and strech less but I would not say any real perceptible difference in bounce. It can be a bit more difficult to fine tune your slings since they are a bit less strecthy, but no big deal. They stay clean MUCH longer and are easy to wipe down to keep clean.

I do not like how they print their name across the entire rubber and have found this can cause weak spots. I have had 2 sling rubbers break in short time. For the most part it seems there are a few duds and they snap quickly. If not a dud then they last forever and don't wear away at the edges.

I was buying then all from PBLife but liek them so much I just bought 4 variety boxes from Germany and it was worth the shipping then. Hoping they arrive soon.