I received these boots last week - they're pretty much exactly what I expected. I ordered the size I normally wear (size 9) - the fit is pretty perfect with normal socks; I could also wear some thicker socks and be fine as well. The area around the calf also is fine for me, at least - not too much extra space, but enough to tuck pants inside.

They aren't overly comfortable boots, but I didn't expect them to be for less than $20. If I was going to be wearing them more than sporadically, I'd definitely spend more money to get boots intended for that purpose.

Update: After about 2 years of periodic use, one of the boots developed a long slit in the back near the heel. I still use them a bit, but they are no longer waterproof. I'd still say I got my money's worth.