"The DPR review indicates that the UI is a chore to use other than for P&S, but postings on the Alt Lenses forum on fredmiranda seem to disagree. What has your experience been?"
If you use the camera as a P&S, it's a piece of cake.
I will agree that the UI was clearly designed by the same imbecile that designs Canon's dumbass cameras — they obviously care about features for idiots more than ergonomics for photographers, serious or otherwise.
That said, I use only manual exposure, and that part is straightforward. The thing that irritates people, and rightfully so, is that for EVERYTHING else, you have to go through menus. So while on my Nikon I can change the ISO and white balance by pressing a button and spinning a dial to the right setting, on the Nex I have to dig through a few menus before I can just spin the dial to the right setting.
Fortunately, I don't care that much about white balance since I *always* shoot in RAW, and white balance is easy to fix in RAW conversion. I don't screw around with ISO that much, but it's nice to be able to easily crank it for low-light scenes now and then. I'm most likely just going to get a SlideFix rail for it and use my tripod, so as a backpacking camera, the idiocy of the UI won't interfere with my use significantly.
There's no mirror on a Nex, and therefore no reason to have a mirror lockup… so I don't miss that part. :)
If you're either comfortable with using manual exposure or don't care at all and would prefer to use it as a P&S camera on steroids, you'll be happy with it, I think. I'm hoping to get some images from my last trip posted tonight — I just to unpack the computer again (been renovating the house).
I would absolutely not want to go back to lugging around my Nikon digitoy with one of these around — and if I'd known it was coming, I wouldn't have bothered with a P&S camera for backpacking (s90) in the first place.