I banged the crap outta my 24" Doubletrack for 2 seasons - then my hub blew up. Ended up replacing the rear with another doubletrack on XT.
..same, i've ran doubletracks on my p3 for 2 yrs, beat the hell out of them and they haven't let me down yet, and no pussy riding, fast, big and even a little hackish on the landings, rims are straight as the day i bought them (almost)