One compeling reason for me to buy the Bessa R2M: solo 75mm frame. The R2M works very well with my Leica 75mm Summicorn after you train yourself to manually flip the frame switch on the top of the camera. I like having only one frame in the v/f when I use this short tele lens for people shots.
I bought the R2M and not the R3M because I don't have nor intend to buy any 40mm lenses.
I hated the lack of the Motor drive I used frequently on my M7 so I subsequently obtained the CV trigger winder for the Bessa. The trigger winder is well made and a pleasure to use. (I have also used both the Rapidwinder and Leicavit winders on both my formerly-owned M6 Classic and M7 cameras.)
Metering display in the v/f on the Bessa R2M is excellent and gives the shooter a good reference and "feel" for any slight over or under exposure one wants to make as a quick compensation.
One smallish point: the film speed is very hard to read in its little adjustment window. Why didn't they just drop the last digit? (800 film would be an easier-to-read "80" in the tiny display.)
The collapsible Heliar 50mm is a pleasant surprise and also feels dense, heavy, implying quality (hardly a scientific measurement here). Since I shoot mostly with the 25mm Biogon, 28mm LTM Canon, 35mm Summicorn ASPH and 75mm AA Summicron, I really have not taken this new Heliar 50 very seriously yet. I having bought it to complete the set with the offered R2M. (I also have two other 50's that also don't get much use.)
I intend for this Bessa R2M to be my last film camera as I have already sold my M7 + two Leica lenses (90 AA & 135) to build up the necessary cash for the M8 already on order with my local Leica dealer. My previous (unsatisfactory) Bessa experience was with two different Bessa L cameras, both purchased new from an authorized CV dealer. Each developed film advance problems (and were discarded!) just after the warranty period expired. I perceive that the Bessa R2M is bit more beefy in construction although I'm still holding my breath each time I advance the film, either with the lever or bottom trigger.
Bottom line on the R2M: good initial value and a pleasing-to-use camera. Now, we'll see if it survives the warranty period intact.