In this video of John Mayer performing *Why Georgia* live, his Dunlop Tortex Guitar Picks can be seen on the microphone stand pick holder. They are green, which corresponds to the .88 mm ones. They can be seen 0:53 into the video. At 1:46 you can see the back of the picks, which looks to have customized art.more
The Dunlop Totex .88 mm is the perfect combo when using 10 guage electric guitar strings. Its harder edge makes that biting pick sound when shredding. Also holds up nicely to long pick scrapes.
I've been using .88 Tortex since the mid 90's and never had a reason to go with anything else for guitar. They're a little too crisp sounding on bass, so I use Mick's thick green soft poly picks for that. Perhaps someday I'll jump on the jazz pick bandwagon, but for now I'm good with my old standby green turtles.