For a cheaper derailleur, the Alivio is really pretty decent. Had one on my 07 Gary Fisher Wahoo, beat the crap out of that thing,maby had to have it ajusted a couple times over a year. And now I have one on my hybred/path bike,shifts great. Also if you reseach them on line they get good reviews. Just like the others said, most likly need ajusted. Or could just be crappy shifters. Try ajustment first. Most shops will charge 6-10 bucks.