I've been using Jazz III XLs as my regulars for who knows how many years, I've often found other picks to sound better, but the playability on those was always tops for me by a wide margin. I was recently getting a lot of problems with them slipping (not grippy enough) and tried out a bunch of new stuff.
Saw these in a store and picked them up on a whim. D'addario makes better Jazz picks than Dunlop, who knew?
man i got these grey picks, they are like 80 grit sand paper grippy