Pros: -the design. i love that monkey
-it's comfy. fits both my size 11 feet. and my feet are 11W
-does what it's set out to do

Cons: -heats only the bottom where your foot arches. so now i'm left with cold toes and the top of my foot is cold
-doesn't have an on/off switch. so you need to unplug it
-cable is 30 inches/76cm <-very rough estimate but i might only be off by 2/3 inches

Other Thoughts: -the cable isn't secured into the footwarmer. on one hand you could be afraid you'll pull it out. on the other hand, you can stuff the rest of the cable in there if you're moving the thing from one place to another

Bottomline: -it does what it's set out to do and i'm somewhat glad i bought it.
-i suggest you buy a usb extension cable. this will make it easier to plug in/unplug because of the lack of power switch
I thought it would be a great gift idea but beware the thing doesn't come in box. It comes in one of those sticker bags and there's no label or anything so your giftee is probably going to be wondering what on earth this thing does haha