i have a pair, some thoughts
pros: They make you run more naturally, help balance, nice on leg day, very light weight, awesome for sprinting/track, ppl always comment on them/attention whore's dream, (con), they're stitched and made well.
cons: You feel every stone on the ground, you better be looking at every step trail running (ankle buster), lot of stubbed toes, if it's cold/rainy they're simply uncomfortable to wear, you have to wash hand/machine wash them n then hours air drying, feet smell like shit after long days out, the soles get pretty quick with use, if you go to beach/river n walk in water - rocks/sand get trapped inside and it's very difficult to keep taking on n off when feet are wet.
I dunno i'll prlly bust mine back out sometime again but I don't like the attention they draw, I don't like ppl staring at me at the gym as it is. Wear em around the house maybe once a week and it's a wrap