I wasn't aware that Airxcel had two motors in the AC/HP. They do not advertise it nor can I find any install/service manuals that reflect that in their line-up. I did not look through all of them as they have a lot of different products.
I don't know if it's industry standard (I don't work on this stuff for a living), but my Atwood came with a QA sheet that was hand-written with my specific unit's power consumption in amps for the various speeds/modes. Nice touch.
When my Dometic died I researched and replaced it with an AirCommand 15k by Atwood. I misunderstood the instructions (actually, I decided I was smarter than the wiring diagram included and paid the price) and fried the control board. I ordered it through Atwood direct, no hassle, and replaced without issue. I've had limited use of it but I do like it better. It's much more quiet, cools better then the 13.5k I pulled off (which it better!)and the heat pump feature is a bonus.
Additionally, it's more generator friendly. My 13.5k struggled at my home at 5500ft asl on a Yamaha 2400ishc. I installed the same hard start cap on this 15k that I had on the 13.5k. Not only does it barely bother my Generator, I am able to start the A/C and run it from my Prowatt 2000 (3k surge) inverter.
The design is better, in my opinion, and shows that someone with some HVAC engineering experience might have got their a but more with the accounting department. It uses two ECM motors instead of a single PSC motor like all other RV A/C units do for the condenser and blower fans. The insulation had an appearance of a better install, and the control system is more "high-tech". The shroud attaches better than my original unit with four stout screws vs the 1+ million tiny screws of the previous unit. The unit is noticeably more quiet then the old Dometic unit on the outside of the RV as well, as the compressor and fan combo hums at a more pleasant frequency.
What I don't like:
1. The fan runs 100% of the time in A/C mode as the compressor cycles off. It does select low speed fan mode, and it's not horribly loud, but I would like it if it would just turn off.
2. The thermostat uses a special communication protocol making it the only thermostat you can use with this unit. The interface is kinda big, and not my favorite.
3. The shroud design looks kinda old/goofy to me when up close to it. On the ground looking up you don't really care and doesn't look out of place.
4. Like most heat pumps, don't rely on it in super cold weather. I've not been able to get it to fire at less then about 45F. Not really a show stopper for me, but the manual doesn't specify what the lowest operational temp is for the heat pump. I was pleasantly suprised at how warm the air is when it is running.
All that said, only had the unit since August, so time will tell.