The Leica Visoflex converts a rangefinder to an SLR for macro and micro photogrpahy so, I'd not quite class it with the rest. A neat tool for the rangefider crowd but not practical for those into close up work on a regular basis unless you have a dedicated Leica setup. I've used mine maybe a half dozen times in 20 years. Does work nicely with the metered Leicas. If I were a regular user, I'd invest in a M5 as the most practical body. I use mine on the CL.
I use my *gasp* Bessa T on my visoflex and it works just fine, just like a leica with TTL metering