I use both R2A and R3A with different Leica M lenses for street photography.
Use the R3A for Voigtlander 40mm and Leica 75mm, and R2a for Leica 35 and 50mm.
As long as they last (physically) they are very good, and they are very nice to use. Have had problems with the rewinding handle of the 3A. Had to change the handle with its internal spring machanism.
Metering is better / easier than M7 at a fraction of the cost.
The (optional) manual rapid winder is very good.
Shutter is louder than the Leicas, so where sound is important I move in with the M6.
You still need the M6 for 28mm.