I use the Fujifilm GA645 rnagefinder. A bit cheating,as it is an idiot proof auto everything camera, but it churns out EXCELLENT slides and the EBC lens is Phenomenal!!! Am never gonna get rid of it. A user's review of the camera is Dante Stella's at
http://www.dantestella.com/technical/ga645.html. Must confess his description was pivotal in my decision to buy it.
Things I like about the camera= medium format rangefinder, nice contrast, fairly idiot proof, point and shoot, auto everything, nice price, easy to get batteries(CR123) small(for medformat), light, fixed lens at 60mm, can work very fast, no fiddling about with knobs etc, can think about composition more, takes 52mm filters(not exotic 40.5mm like contax), auto wind for film,leaf shutter which is so silent (need electronic beeper to let you know it has fired) and smooth(cannot feel it moving) all round fun to use point and shoot camera like Leica on steroids
Things I dont like = cannot really tell where is the focus point sometimes, focus is not continuous range , ie it focuses in steps with prefixed distances,
a bit slow(as autofocus cf to 35mm), but much faster than manual focus, only takes 15 (not 16) shots per roll of 120.
Not everybody's rangefinder, but does bear serious thinking about if looking for a medium format rangefinder!