At first they feel great but after wearing them for a few hours for wedding they started to hurt the toes. There are a few minor upsides to the Rival 310:- The buttons have a slightly more satisfying click- The DPI toggle button is better positioned and much less likely to get pressed on accident. We have an expensive mattress and I wanted to ensure we were purchasing the correct product. These are extremely comfortable (I know because I have my own), durable and have very good traction. It also looks very elegant! The earbuds will only charge on the pad facing a certain way. God I love these shoes. This spice organizer is huge! The high amount of good reviews is what got me to go through with the purchase, though. I read the reviews first and made my decision based on what most people recommended.