I have medium volume feet with high arches and a somewhat narrow heel and ankle. My feet must have great arch support and, because of bad knees, I do best with a 2" or 2-1/2" heel. I can wear somewhat lower, but not flat. My PG booties fit so well I can, literally, walk in them all day. Because of the bad knees, I don't walk all day very often, so that I can do so in those booties says a lot!
I have other booties I enjoy quite a lot--my Eileen Fisher is very good--and I'm always on the lookout for another great bootie.