I bought the correct size. I am a US7.5 and I always buy size 8 so shoes are extra loose and comfortable on me. These are at least one whole size too small. I could barely get my feet in. I'm hoping in time they stretch out because I really don't like tight shoes.
I bought them to use as indoor slippers where I'd occasionally go outside, but I plan on helping out the stretching process by wearing them as often as I can--everywhere!
Packaging wasn't so great. They were packed tightly together and the plastic they're made of is that unforgiving kind that just doesn't ever seem to return to normal size. I have had these out of the bag for over a week and they're still mis-shaped.
They are also very squeaky and noisy. Makes it interesting to my cats! LOL