So I listened for almost 4 hours last night, and I've been listening to these at work all morning.
I'm still not sure how I feel about them. They definitely sound good - imaging and separation are great, and the soundstage is pretty awesome. Still, there's something I can't put my finger on. They're just not engaging me for some reason - maybe they're too analytical for my taste?
I'm going to listen all day and see how I feel later. I've decided that if I can't get into these, I'll try the BA200s. From what I've read, those also have great imaging, separation, and soundstage, but add a little warmth and sweetness, and that may be what I'm looking for that I'm not getting right now with the R-50s.