If you don't enjoy strongly converging vertical lines in your shots, you'll have to work really hard at keeping the camera level. Any (and I do mean even the very slightest) tilt, and the verticals will converge like crazy. Unfortunately the aux. viewfinder has a lot of barrel distortion (shows straight lines as curved - just the viewfinder - not the lens), so it isn't easy to judge this in the Viewfinder.
I've often considered getting the swank Voigtlander double-shoe accessory and one of those really nice Voigtlander eye-level levels, in spite of the buck$$$ that that setup costs. In the meantime,I've had good success with taking my eye out of the finder just before making the shot, and looking at the camera to make sure there's no tilt.
That's my only gripe. The lens is very sharp, has massive depth of field (1 meter to infinity wide open ), and is nearly flare-proof. I've read that on some cameras, or with some LTM-M adapters the lens doesn't line-up exactly at 12 o-clock, which is a problem since the non-removable lens hood will then cause vignetting, but I've also read that it's easy to re-align the lens by loosening 3 set screws. Mine works fine with the Voigtlander adapter.
BTW, it focuses down to 30cm (about a foot), so you can do some neat close-up stuff with it too, though you're pretty much guessing at the framing at that range.
