Whether a camera is a TLR or SLR or rangefinder or whatever is independent of format.
I got three Blackbirds when they came out. I got them for $80 a piece through an E-Bay seller in England. I kept a blue one for myself, gave an orange one to a friend, and gave a black one to my favorite teacher for Christmas (mainly for future use in the Experimental Photography class that I tutor, in which there is a plastic camera assignment). They are expensive, even at $80, but I fell in love with some of the example photos from them, so took the "plunge." I have ended up getting my money's worth from the camera.
When I first got it I posted my thoughts here on A.P.U.G.: http://www.apug.org/forums/forum234/...pressions.html