Wow, alright first things first.
1) tiger direct doesnt handle the rebates first off. You get them off the site, print them out, and send them in with the upc. It is direct with the manufacturer. So obviously they arent notorious for anything, due to the fact you dont know what the hell you are talking about.
2) You ever tested the PSU witha multimeter? Thats pretty much the only way you would know if it has steady amps or not, I assume you are referring to voltage.
Thats my critique.