I was actually shopping for the Dava Jazz Grip Delrin pack since I almost exclusively use jazz picks, but decided to give the big floppy picks a try and bought the Dava Mini 5 Pack.
I'm the wrong person to review the other picks than the jazz one, but I can say all of the Dava picks have a great build quality. Their grip is excellent. But still... the big floppy picks are not for me... for any kind of playing.
Now for the jazz pick. If you're used to the standard red Dunlop Jazz III pick, the Dava Jazz pick might seem strange at first.
-The Dava pick is bigger than the Dunlop one. Not by much but it's noticeable.
-The Dava pick feels softer and I feel like it degrades my playing by allowing me to play more sloppily. I don't seem to get as sharp nuances out of the Dava pick as I get from the Dunlop one.
-The Dava pick has an EXCELLENT grip. Even if I sweat buckets, it does not slip or fall. I like this property alot.
I still prefer the Dunlop Jazz pick, but definitely check the Dava Jazz pick out.