Hey, I can share my experience. It really depends on how far back you are. I've found that my bands work well for weights, but there is simply nothing that can replace pulling your own bodyweight up against gravity.
What I've done is to find a playground where there are monkey bars (if in the US) and to use those as my pull up bars. I'll run through the P90X workout, then do the pull up routines by set (set of 3, set of 2, set of 1, and reverse) to give my back a solid workout.
Hope that helps.
Search youtube for playground workouts - http://www.hulu.com/watch/280274/revenge-t rust#s-p2-so-i0
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