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This actually is the case. They're not quite as appalling as they used to be, but Kinlin still rates around the bottom of the barrel as far as rims I've built, along with the Stans Alpha 340. They're wont to come out either not entirely round or not entirely true out of the box, which makes it extremely difficult to build them well enough to be reliable. H+Sons on the other hand tend to be quite round and easy to build.
As for the braking woes, if toeing and sanding the pads doesnt solve things, the next most likely cuplrit is the wheels being either out of true, or some inconsistency in the brake track. I'd check the trueness of the wheels, and try to isolate the part of the rim where the noise/juddering is coming from, and see if there's anything out of order about that spot. Old non-machined rims had a greater susceptibility to this, which would explain the issues with the MA2s.
Why you winking motherfucker. Because the quality of Kinlin rims isn't as good as H+ Son.
Dan - I didn't find the braking very grabby. I thought it was good. Better than my current rims but not as good as Belgiums.