I?ve spent high dollar amounts on name brand trainer vests and hey have nothing on this one for 1/4 of the cost ! They work great! The SinLoon 4. Soft, walking on clouds feeling, lots of flexibility due to the stretchy knit structure of the shoe. Didnt time it, but they should last near the claimed 16hours playtime. I love the beveled crystal style. I was not able to keep my I phone 6 earbuds in whenever I was outside gardening or even going for a walk, they always keep falling out. I think the defect is because its a renewed product. Someone with a narrow foot might slide around in these if they arent wearing socks, but for my very wide feet they fit well. The little shelves are not level at all and I had to bend the pieces of metal those screw onto to attempt to get them level ( thats when I realized that the reason the shelves went level is because those little metal pieces that they screw into are not attached to the rack evenly) but that doesnt matter much to me because I probably wont be using the little shelves.