This unusual looking (maybe the word different...is more accurate)
space heater wasn't acquired without some anxiety.  However, it
operates well in a 700 square foot room..., and that's why it was purchased.  The controls are not intuitively understood, but taking the
time to look at the manual before you use it...will pay dividends.
The question of economical operation isn't addressed...because there has not been a way in which to measure its operational cost.
This has been a newsworthy year in terms of frigid temperatures
for the majority of the nation, but this heater nevertheless competes
with the natural elements to put out a highly respectable performance.  This review concerns itself with nothing else but 
a binary question of does it work well or does it not work well.
It works well, and is recommended, accordingly.