I'm nearing the end of my 3rd year on a Dakar XLT; started out with the 'air can', Manitou Swinger 3 w/ platform valving. WHILE IT WORKED, it worked superbly. Trouble was, it didn't last. 8 frickin' months later, I was looking to swap in a coil, because the seals went out. No factory support AT ALL. I have a coil on it now that's an awesome performer, not a bit of trouble.
The bike before it was an air-shock-equipped FS, too, and it only had rebound and lockout. Bobbed noticeably, but not horribly. The shock gave out during final teardown in preparation for the XLT.
I heartily recommend coils, but that's me.
BTW, 6'1", 235.