A rangefinder is a camera many of my generation abandoned in our youth for the flashy SLR; then in wisdom gained from age, returned to it for the shear pleasure of its use and timelessness of it's design.
I may be primarily a LF kind of guy, but, I'll always keep a rangefinder in my kit!
P.S. Does anyone else feel so old after reading the question?
P.P.S Hanaa, no offence intended, I'm so glad you asked and gave the rangefinder folks a chance to discuss their love of what some consider an outmoted technology. I'll go back to LF land now and leave the thread to the experts.