I was really into them for a few years, picked up a new set every time I went to the States. I am one of those people who never got onto regular fingerpicks.

First I used the plastic ones, then I switched to metal cause they're more durable and you can bend them to fit your fingers better (slippage can be a problem). String noise can be a problem with the metal ones, I switched back to plastic for awhile then gave up entirely. I think I'd have another go at them if I wanted to do the serious fingerpicking route. I think they are a really good concept that last time I checked hadn't quite worked out all the bugs...