Craig Gillette , Aug 12, 2008; 12:43 p.m.
It seems to have taken several "generations" of product for some of the knock-off or start up competition to get to the point that functional quality is up to real competition with the established tripod leg makers. I don't think they are there yet with the ballheads. Not a lot of people taking the chance on them or talking about it if they have.
I would expect they would be compatible with the Kirk or RRS L brackets, the main compatibility problems seem to come with the lever type clamps, not screw clamps. But the Arca Swiss "standard" isn't a standard and not all of the products are compatible. Again, it may take some users to actually buy and report on their results to build up the community knowledge base.