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hMaybe its just me but I much prefer the noise of the shutter over no shutter sound. I picked up the V1 when they first came out. I liked the small package size but the IQ and lack of shutter sound turned me off. I believe it had an option for mechanical shutter or no mechanical. The mechanical was a little better but I returned it.Why I like the DSLR more is the AF-on, the view finder, the extra buttons for DOF or whatever your set them to. The flash capabilites, sync ports, sb-xxx, etc..
I would say fewer mechanical parts would mean more electronic parts which are more prone to malfunctions.
A lot of talk about how a mirror less camera can perform as well as a DSLR. But what do we want on top of that? What needs to be better? What real world problem do we want a solution for?