I bought a pair of the generation 1 XPA-1's last year to drive a pair of BG Corp 520DX ribbon/hybrid loudspeakers. I'd been using a Theta Intrepid and biamping the speakers with 200 watts/channel into the speakers' 4 ohm load. The sound was smooth and detailed, quite open and transparent, but also slightly lacking in upper bass slam and weight. The speakers are rolled off prematurely so the bass performance wasn't a surprise. I wasn't necessarily looking to upgrade the amp as I'd also been using a pair of Def Tech subs to good effect. However, I saw a pair of the XPA-1 at a good price and thought I'd try them out, after all, I could always resell at about the same price I'd paid.
My source is an Upgrade Company modded Oppo BDP-83SE, which I drive the amp(s) directly from, and the cables are all sourced from a very good silver plated copper solid core wire. I use the Oyaide 046 plugs on my power cords and have a Maestro outlet in the wall. My system is hi-rez on a budget but I'd put it up against anything in stereophile's Class B. I bet it could even challenge some of the Class A contenders.
Having said that, I want to stress that my conclusions are based on my personal feelings of the importance of resolution, transparency, and PRAT or boogie factor. Installing the XPA-1's into my system and using the same power cords and interconnects, I was immediately aware that the top end had lost some sparkle, that it seemed closed in, perhaps even opaque. Detail was good across the spectrum from upper bass on up but I just wasn't as engaged. The Emotiva amps were more bass prominent, not necessarily tighter or more detailed though. So, if you need the extra wattage, the Emotiva amps are pretty good for the money but really the Theta outclassed them easily.
While still in possession of both the Theta and Emotiva amps, I picked up a Cambridge Audio 840W. I had to wait a week for a 20amp Oyaide 046 plug to arrive before I could do a fair comparison but, even hampered by the stock power cord, the Cambridge seemed special. Another week gone by to let the new plug burn in, I compared the Cambridge to the others. I felt the Cambridge to at least equal the Theta in detail and smoothness but it was obviously the more transparent amp and the 840W has a killer bottom end. I found myself turning off the subs (which were set at lowish levels anyway) because their input wasn't needed and it muddied up the sound. I've since pulled them from the system entirely and never miss them.
Now compared to the XPA-1's, the Cambridge was in an entirely different league. There was NO area where the Emotiva amps bettered the Cambridge. Actually, they weren't even competitive. If you like a warmer, fatter bass, then perhaps you might prefer the Emotivas in this area, but otherwise, I can't even imagine anyone preferring the XPA-1's on sound. The do look like a lot of amp(s) for the money but you can do MUCH better in this price range. Sorry if that disappoints but you shouldn't have any trouble reselling them. Good luck!