I don't shoot much 35mm these days but used Spotmatics for years later Pentax MX/KX. However I bought a rangefinder camera (Leica M3) in the late 1980's and it became my preferred camera for general use.

My reasons are much the same as have already been given by David Allen, Gerald Koch etc. In fact the M3 is a touch heavier than my SLRs which is an advantage, greater mass makes a camer less prone to camera shake at low shutter speeds.

If I went back to 35mm I'd contemplate a Bessa alongside the Leica and also some of their lenses.