If you filter, it may be worth it
I bought two of these to use with two CamelBak 3L bladders for a week in Yellowstone NP. Absolutely no problems with either valve. I put a female end on both drinking hoses, one male end on a short section of hose with a bite valve, and the other male end on a section of hose I attached to my MSR HyperFlow filter. Pumping straight from the filter into the bladder was very easy, and being able to change bladders quickly on the trail was nice. I also found that I could plug the male/filter hose into a bladder for a strong stream of water, without messing with a bite valve.
After fighting to pump water into a CamelBak bladder's main opening, using the Platypus Quick-Disconnect Kit was well worth the money to me.