I LOVE mine. I don't have a "real" Camelbak - it's an REI one that uses Nalgene products, bought it on clearance for $20. But it's great. Keeps me hydrated and delays bonking. I get dehydrated really easily for medical reasons (it's a long unpleasant story...), so on hot humid days it's a god-send. I put ice and water in it, and it even keeps my back cool!

It may not be "roadie" but I wouldn't go without it. Mine holds 70 oz (about 2L) and has a little pocket for keys, Luna bars, etc. REI is having a sale next month - I would definitely check it out!