Alright, so I was just watching the guy's unboxing video, and realized - I may be overestimating the impact of lack of lens shift. The only reason I would like lens shift is that my projector needs to be offset above the screen somewhat, or I'm limited in size (due to an angled ceiling). Right now I'm working with the size limitation, and plan to continue to do so. And of course, I don't want to use digital keystone correction to keep image quality intact.
However, looking at that vid, it appears the epson has mechanical lens keystone correction, meaning no digital artifacting! Are there downsides to mechanical keystone correction, or is it actually OK? I don't need much, just about 8-10* angle or so.
So what are the downsides to mechanical keystone?