I started playing guitar on Tortex's, and I'm going to use them for a very long time. Great all-around guitar picks. Nothing fancy, but they do their job well.
Great picks. The grip surface is soft and smooth and actually works pretty well. They slip if you start playing super heavy with them, but that's not what they're designed for. The yellow (.73) is one of my go-to picks for guitar. I tend to stay away from anything thicker than that because the squared edges make a clicking sound that I don't like. A lot of people don't have a problem with it, but I just prefer to have smooth, round tone without any extra string noise.
Excellent build quality. They're flexible and resilient, and they hardly wear at all. I've had the same yellow Tortex for 2 or so years now and it's worn less than half a millimeter. I don't like how the logo wears off very quickly, but it's not a big deal. Broken-in Tortex's look cool. I just wish they could stamp the logo into the pick rather than on the surface, like with the Gator Grips and Delrin 500's.
The price is a pretty good price for a dozen of these well-made picks. And a dozen will last you a really long time.