The Hyperglides are nicer, because the rounded edges help to make them glide smoothly from the very first usage. The Corepads are ok, but the sharp edges require some "break-in" use, before they glide consistently smoothly, especially on soft/cloth mousepads, but they're fine after break-in. Corepad DOES have a longer list of replacement glides for various different mice, including some which others (apparently) don't offer (yet). Corepad, AFAIK, are the only ones offering replacement feet for the Naos and the Spawn, for example. Unless you want to take a chance on some eBay vendor. Availability is another aspect, it seems Hyperglides are harder to find in stock. I did have one strange experience with Corepad; along with my own order for Naos feet, I ordered some Razer Diamondback/Copperhead feet for a buddy. The feet turned out to be way too small, and didn't fit the mouse well, even though the general contour shape was similar. I suspect they may have been made for an Asian-market-only version Razer Diamondback or Copperhead, if there was/is such a thing, or else the packaging was mislabeled (maybe actually for Salmosa?).