Nice work Eric. I do agree with Woodman, though, I'd like to see it without the squiggles. (Actually, as it is, it reminds me just a little of the outfit on the guy in the recent beer commercials.) Otherwise, yes, I'd pay $15 for one.
My first thoughts were the orange letters made me think of mango before mando. I like orange, and I like both mangos and mandos, but I *think* I would choose another color. I like the "8". Squiggles, plus the inherent squiggles of an F style made me think an A style mandolin would stand out better. I play them both without prejudice. I want a "t" shirt, whatever the final design. I yield completely to your good judgment, Eric.
I'll probably just do black for now, then maybe a different color down the road. Since I won't be selling a lot of these shirts initially, I need to stick to one shirt color to production costs as low as possible. That way I can keep the shirt price down, too!