I'm a QD guy. I have the males on all hardware (kettles, pumps, etc.) and females on the hoses. They're quick, easy, one-handed and they just work. I bought all mine from the same place to ensure compatibility.
Okay, I drank the koolaid and followed the advice from this guy on BrewHardwar.com and invested into more camlock style quick connects. My LBS only had two, so I purchased the other three from Amazon. Comparison to fit and finish as well as dimensions and sizes of o-rings were very different. I can interchange the connectors, but they are too loose on one and too tight on the other. What is very concerning and very frustrating is that the O-rings are completely different and not interchangeable. This all is in contrast to what this guy is claiming, that these camlocks are compatible across different manufacturers. THIS IS NOT TRUE!!!!!!! The cost differential between camlocks and ball locks depends on where you shop. My LBS could have sold me ball locks at $2 USD more than camlock. So the take away here, is that price and compatibility are no longer an advantage. If anyone is interested, I'll gladly add photos of the camlocks.