I have dual 34mm VM's on my 850 cafe. Works great with a modified motor, but you have to use splayed manifolds which do not allow use of a stock airbox. I am using oval - taperedl K&N filters that just clear the frame loops.
The single Mikuni kits I have seen have a quite sharp bend to the throttle cable as it exits the carburetor.
My biggest complaint with Mikuni's is they tend to varnish up rapidly when not used often and cause sticking of the floats and gas flowing from the overflow tube. Of course the obvious answer is to run the bike more!
However, if total performance is not my ultimate goal, I still like the simplicity of sleeved Amals.