The 7 is a very good and modern rangefinder. Some cameras make these slightly whirry sounds, even Leica M's, and yet function well. If the speeds are about right and the shutter is not tapering, you will be fine. A CLA on the 7 is not a big deal however (and one should not pay more than $100) if you ever want to really fine tune it. The curtains are metal, so one does not need to worry about the expense of replacing them as with many other rangefinders from a slightly earlier time.