Hand-built wheels are great - if the builder knows what they're doing. And actually, I think the Quality wheels are built by machine. For other prospective PT SL buyers reading this thread - if your LBS doesn't have a solid, experienced wheelbuilder and you are forced to buy online, I'd recommend going with someone like Troy Watson
www.ligerowheels.com or Richard Sawris
www.wheelbuilder.com . Their prices are competitive and, as you can tell from this thread, it's worth doing right the first time.
FWIW, I got bored this afternoon and weighed all my wheelsets. (Tapering, and have too much extra time/ energy!) My PT SL pair weighs 1580gms - with rim tape. Was considering using my Ksyrium rear wheel for some target races next month, but don't think 30g outweighs losing the data.