I bought an M3 mit 50/2 Summicron in 1985, after 20 years of Pentax Spotmatic SLR's(very, very good cameras, by the way). I was fascinated by the small body and lens. I could stick it in pockets a Spottie would never fit into. After my fifth roll I realized I had purchased something akin to a fine Rolex; I had never before thought of a camera as a work of art. I remember the first roll when I kept thinking the shutter hadn't released because it was too, too, quiet.
But alas, I was so conditioned to an SLR with all of its interchangeable lenses that I found my M3 limited (and hard to load, though I never made much of an effort to learn it proper). And so I made the worst mistake of my camera-owning career and sold it.
A few years ago I happened accidentally onto Stephen Gandy's website and read about the Bessa R. The price was certainly reasonable, so I bought one and then the Color Skopar 35/2.5.
I was astonished by the bright, crystal clear viewfinder and the ease of focusing, and for me that's what it was all about - the visual experience. I didn't have to worry about fine focusing an SLR lens anymore - all I had to do was align the two heads and release the shutter. The kit was quick, light, easy to use, and since then I've added a 21/4 and a Canon 50/1.4 and sure, the Bessa's no M3, no silky advance, no religious experience - but it works just fine.
Will I ever get another M-series Leica? You bet, but it will take time as I'm retired and living on what they call a "fixed" income.
But someday my prince will come...
I use an RF because it's discrete, quiet, unobtrusive, not at all threatening, and ideally suited to street photography.
When I want to do portraits, I open up my other kit bag and take out the Rolleiflex.