Seems pretty viable for someone who has lots of solar and wants an all electric camper. I like that it's portable so you can leave it in storage or home when you don't need it.
Solar panels generate electricity but they don't store it. The Wave can't run off solar, it needs a 12v (or 110v) source. So a large battery bank is still needed. In broad daylight, it may be possible to have enough panels to compensate for the energy the AC is using, but the concept is inherently flawed. Maximizing solar generation requires being in direct sun, this is in direct conflict to parking in the shade being the lowest hanging fruit to keeping a vehicle cool. RVs are metal boxes and cooling using solar electricity is never going to be efficient use of power.
While the Wave may be more energy efficient than a traditional electric space heater, it's still a lot less efficient than propane, petrol, or diesel. The Wave is expensive, for that kind of money there are better options. For vehicles with gas engines, the Webasto petrol heater is half the cost to buy and uses very little electricity (and gas). Unless plugged into free shore power, electrical heating doesn't make sense.
Portable is nice in theory, but my experience using a portable diesel heater leads me to think real world use would be disappointing. These units are not small, and they have to be put into position somewhere (I built a stand that hung on the inside of the passenger window). The hoses have to be ducted somewhere depending on it's carrying: water, hot air, fresh air (or in my case, exhaust). The power source and cord has to be managed (in my case routed so it wasn't a trip hazard). The bottom line for me was the simplicity and portability wasn't worth the hassle and inconvenience. I disassembled my all in one diesel heater and permanently mounted it. I suspect I'd reach the same conclusion with a portable AC.