I live in Austin, had great experience with the shuttles last year and I expect no less this year. I think they have shuttles from downtown so it probably isn't too far from your hotel.
Last year we sat at T12 but we sprung for PSLs this year so we are on T15 and don't need to worry about rushing for tickets. We just had the Rolex Grand Am race this past weekend and it was fantastic...counting the days until November!
"Now I guess I'll have to tell 'em...That I've got no cerebellum" - The Ramones, "Teenage Lobotomy"