I had a regular camelbak (shoulder straps) and never used it because my shoulders would be so blasted sore at the end of a long ride. It was great for the water, but the pain wasn't worth it. Forgot the camelbak on a trip to asheville and DH surprised me with a waist back from Liberty Cycles.

I *love* it. No sore shoulders. Doesn't interfere with my road bike position. Also doesn't hold as much water, so I have to either re-fill or carry 2 bottles too (usually use those to refill the camelbak b/c that's where I drink from given the option). Not the prettiest thing in the world for those of those with a "middle roll", but who cares if it works!