The ALO Rx at RMAF sounded very good - I love my P-51 and consider it to be my best portable amp, and the Rx was at least as good during the brief time I spent with it. I think I listened to it with both a re-cabled Edition 9 and an HD600 (or my RS-1, I forget now). It made me miss my Edition 9.
My only problem was the size being thicker and wider than I care for when pairing with my iPod nano (or iPhone). But I think the RX paired with the digital line out dock/DAC in the same case will still be a slimmer package than my portable Vcap dock and P-51. It will sit flatter as well and not tip over if I press the controls on the iMod, so I have thought about maybe getting it for that, since I would like the iPod digital out DAC device someday.