i have two pairs of vffs, kso for everyday wear and bikila for the gym.. i absolutely love them. when i wear them, i feel kind of liberated, like my feet have been locked up for all these years, and now they're free. ever since i started running in them, i haven't had any knee pain. and i can run faster now. i got them in may, so i'm still trying to build up my distance in them since then. i was running about 4-6 miles at a time with nikes, but building up my legs has taken time with vffs and i'm at around 2.5 miles now. it sounds weird to say it, but my feet are a lot stronger since i started wearing them.
i do admit they're ugly though. even when you ignore that it's a shoe with separate toes, the designs are very outlandish to me. There are a few simple, modest designs, but otherwise, the colors and patterns for many of them look weird. i can overlook that though, because they feel awesome.
fyi they're machine washable, which is great. like with conventional shoes, i do wear socks with them though, which so far has been good in preventing that stink which seems to be common with people who wear VFFs barefoot.