Lord_Suston,
Good call, I was thinking oh sh*t my arches, before I even opened the thread. I would definitely not recommend them.
Stryc-9, what you probably feel is that your feet have a better platform with which to work because they are right on the ground, no foam/air in between your feet and the ground. However, sneakers sell for a reason (well marketing, but anyway) if it were safe/better to squat barefoot, I would think you would see more people squatting in socks, or something like that.
Not trying to flame, just my $.02
NateDogg