Overall they are interesting. The aim to using one pick for strumming and solo is a good thought, but in the end they are not great for either. I am not saying they are bad, but there are better picks for strumming and better picks for soloing. So it does both on average level. One things that is very good, is that it has a very nice grip.
I am seldom using 2 of them: the yellow, and the small red one(grip tips and jazz grips).
Metal one- this one is made from nickel silver. Sometimes I use this, for fun, as it gives a really chimey sound on an acoustic. I had a metal pick yars ago, but didn't like that it was too rigid and slippery. Well I don't have the problem with this as the grip is great, and felixble. I guess the metal pick is not the most string friendly :)
Red rock control delrin and the blue master control nylon - well tried it once, and never used it since.