When I first started using a Leica rangefinder I cursed to myself about inaccurate framing, no depth of field in the finder, tiny frames for the 90 and 135, bottom loading, , and a few other typical complaints. Coming off Pentax screwmounts at least I was used to top speed of 1/1000 and slow flash sync . After putting forth the effort to understand how the frame lines are configured, I was able to quickly adjust my composition so that what I see in the finder is what I get on film, and once I said to myself "hey, you've been doing this for 35 years, you know what d.o.f. will look like for each lens and aperture, even if you can't see it in the finder" that became a non-issue too. The 90/135 frame size, and the bottom-loading were also issues that were easily put to rest simply by allowing myself to adapt rather than being stuck in complain-mode. What resulted is the discovery of seeing the shot while the exposure is being made, not just before and after as with a SLR. That alone is what has spoiled me in favor of the Leica M.