Re: How do people play with 9 gauge strings?
I've gone as high as .12's for a little while, but when I switched back to .11's, it was like I had the sound of the 12's and the feel of the .10s. So that's what I've stuck with. I like how you can really dig in to notes without going out of tune. I also think it's possible to play fast on .11s, especially on a les paul or other short scale guitar, it just takes practice.
edit: to respond to the op: I don't know how people play with .09s, but I envy their finesse. And they'll probably have fewer finger problems later on.