Nothing wrong with this pick, and it does what it's supposed to, stay in your grip even when your fingers are slippery from sweat, grease or anything else :)
However, I tend not to use it on a daily basis because my fingers aren't that slippery very often and my Tortex picks sit tight just fine. The sandy surface is a bit rough to the feel - as it should be on this pick - and can frankly become a bit annoying. On a live set though, I'd rather have one with me than not, just in case.