Having had a Bessa R for over a year now, I have demonstrated to myself that it can be used for many purposes, but isn't versatile enough FOR ME to be used as my sole camera. In fact, I have found my Minolta A1 digital (bought about 6 mos. ago) to be far more useful even though it has slow autofocus (compared to an AF SLR...it's AF speed is on par or better than non-SLR digicams) and is next to impossible to focus manually.
As for focusing, it is easy to focus an RF in low light but quite difficult to focus on a moving subject (eg: my son's head). The fact is, my Minolta Maxxum 7 film SLR can focus in extremely low light, and if I activate the focus assist beam, it can focus in the dark...and it can do so quickly.
Where the Bessa shines is in its small size, relatively quiet shutter noise and unassuming appearance. In short, it is great for street shooting. However, I have found that my A1 is also extremely good for street shooting. I can set it to manual focus, aperture priority (or manual exposure), and it works quite well as a fast street shooter. It's only downside is too much image noise beyond ISO400. It is virtually silent, has a waist level finder (tilting LCD), and its small sensor gives it huge DoF even at f4.
Once these high end digicams come out with a larger sensor (noise-free at ISO800), I can't see any reason for me to use a film RF.
For those times when I need to use film, I can fall back on my Minolta film SLR. And if I really want to get retro, I can use my Nikon F's or buy an FM/FE.
In short, with the dropping cost of digital, the RF is no longer my ideal street shooter. Having said that, I still enjoy shooting with it, but I don't know how long I can use that justification to keep the camera.
...lars