Firepower is made by Thermadyne and is really the same as their Thermal Arc models.  Thermadyne is a high end company, just go to there website 
http://www.thermadyne.com/.  I have a Thermal Arc Arcmaster 185 AC/DC Tig welder and it is bad ass.  Much nicer with more fine tuned settings and options than the Lincoln Invertec that I was previously using. I dont have any experience with their migs though.