There are three (heh) things to talk about when discussing picks: material, shape and thickness. The brand name is something I personally don't care about at all.
So, tortex material is well known for its natural sound and real-tortoise-shell-like feel. It's grippy and nice to hold. For reference, I absolutely hate Ultex, find vinyl picks too slippery, and carbon and steel ones too harsh. This is a perfect balance.
The shape of this pick is really interesting, as it brings the tip of the famous Jazz III pick together with regular Tortex handle. A matter of taste, but I find it better than the regular tortex. The only downside is that it seems to lose the shape much quicker... but maybe it's just because I play more thanks to it!
The thickness is a matter of personal preference, but I would first see what strings you use. 0.88 works fine with 9 or 10s, up to 52-ish in bass. If you play thicker strings, consider the 1mm one. If you play mostly (heavy) rhythm, it's worth exploring even thicker picks for the added attack and bite.
