I think there are still some gaps in the repo - Apache isn't complete, no lomanager, no tunctl, no audacity. Maybe there is a problem compiling some of these for 64 bit. With only one section Synaptic is really fast though.
Kwin works on my desktop, but not on my laptop (mobile 4 Intel graphics - complains GLX is missing) in 64 bit. Both work in 32, so something's not quite right there, but it is shaping up nicely.
64bit is barely more than half full. It is inevitable that there would be "gaps."