I've tried some mouse skates, the Steelseries ones, Razer ones, and the Hyperglides are in the mail.

I use a 3.0, but I know this forsure. Razer mousefeet are only slightly more smoother than the default ones, but the Steelseries are EXTREMELY smooth. Honestly, don't get them if you play on a high sens. I think these were designed for CS players in mind, for low sensitivities. I will try the hyperglides, and I'll be sure to make a little scale of smoothness for all the feet.

is there any product difference anyway ? that's teflon bands, nope ?

Tried this on a plastic mouse pad. It sucked.

doesnt make much difference
I support Hyperglide because they're always the first to support new mousefeet. Here I'm also sure they round the edges for extra smoothness. Next to that, the owner is a friendly guy :) When the Logitech G3 came out, I asked him for new feet. After I send him a photo of the shapes, he send me a prototype to see if it fits. And after all the final product.

hyperglides are great imo ;D

toasting an old bread but I would always try to get thick replacement feet, these thin overtapes are not worth the money and effort because they wear out in a day or two and make your gaming experience horribly unconsistent.