I've been using the standard 0.73 Dunlop for years, but I needed something more precise and fast for technical pieces.
The standard version beeing rounder, they are a little less "schwifty". As they were off, it becomes even more obvious.
With those Tortex III 0.73, you have this very pointy pick allowing very controlled mouvement. I particularily love them for soloing and economy picking. They also do great for rythm guitar. They became my bread and butter.
In the hand, they feel stiff but still have a nice "slapping" sound.
I usually play with one for several weeks (their pointy design is quite durable) but keep in mind that I have a rather light touch. I can't really comment on "grip" as I do not have sweaty hands, but they feel great.
I also tried
The 1.0 version: also great and maybe a little bit more appropriate for heavy pickers.
The 1.35 version: very stiff but completely lack "slapping" sound (and brillance). I guess those are better for heavy handed rythm guitar player. They must be veeeery durable.
Conclusion:
Amazing for lead guitar players with standard attack/touch.