hmmm.... I've never used anything metal, that didn't "sound" metal. For me, (I know what you're thinking already...) that was not a good thing. It could work with some amps/guitars/tones but NEEDED to be EQ'd around, and I didn't like it. Plus, any time you play with something that is harder metal than your strings, won't you wear them out unusually fast? Plus, plus, playing with a rounded item... no point... not for me. No rounded item A) gives the attack I want on the note or B) allows me to control that attack by varying pick angle, or C) allows me to pick fast or accurately... I always angle the pick and while my strike angle varies depending on what I'm doing, the only time it ever gets flat is if I'm strumming chords. When playing individual notes, lines or leads, the pic is angled. Angle something round and it's impossible to pick one note without hitting the notes on other side of it UNLESS you have the thing completely parallel to the string. This forces you to play with a pic running parallel to the strings only. No freaking way I'm going to do that.
For these reasons, I'm out!