I have two 645s, both purchased well used. I love them - completely reliable and I am shooting them more and more all the time. I am accustomed to the buttons to change fxns and shutter speeds. A feature that, to me, absolutely RULES is tripod mount on two different sides so you can mount for horizontal and vertical shooting with ease. I don't really use their meters much but could without worry, they seem to be spot-on. And I really dig the glass, I have 55mm, 75mm, and 150mm and use the 75mm 80% of the time.