I'm not impressed. I'd like to see the power consumption and heat output figures for these really small units.
When you can buy a good 500-700 watt unit for $50 ($15 at a yard sale) and run it off your inverter and house batteries, what's the point in a way underpowered ~$200 unit?
Too be really useful, you need a 1000 watt or more unit anyway, if possible.
Sorry to be negative, but it looks more like a toy to me.