I never noticed the prices on their inverters to be much if any cheaper than other places with name brand inverters. I don't know the quality of the sine wave or the longevity or efficiency or no load current draw.
I bought a coleman 800 inverter from Kragen 6 years ago for 50$ on special and have abused it pretty good via a variable speed miwaukee 12 amp polisher/grinder and other sub 6 amp power tools. I did replace the fan inside it because it became so dang loud over time.
It draws 0.9 amps when turned on, but powering nothing.
I have smoked a 400 watt coleman.