I have one that I swap components out between a 91, 93, and a handful of 94s/Clones. It takes a bit of cadence to get used to it. The trigger itself is surprisingly nice.
It is fun to run fast RPM, but I certainly don't use the binary action all gung ho every time. It's fun for the camera and it's there if one needs it.
I purchased the assembled-by-order from hkparts. It's not that difficult to do it yourself though.