I've had a camelbak since their very first model back in the 90's. I used it first for mountain biking, but when I got into hiking, I found it to be just as useful.
Personally, I think it's just easier to grab the tube and take a few drinks than it is to get the nalgene out of its carrier, slow down so you don't spill it while taking a drink, then putting it back into its carrier.
I keep my nalgene in my car to drink out of when I'm done with the hike.
**edit** Oh, you mean the Camelbak bottle. lol. Between that and a Nalgene, get a Nalgene. Unless you really like the straw action of the Camelbak bottle.