It is very difficult to compete with accurate ratings... I don't plan to change, but I hear it all the time.
My B&M dealers will sometimes comment that "brand x" 100x2 amp costs less than my SAX-100.2 -- but the SAX-100.2 does it's power at 12.8 volts (less, even).
Then... cheap companies will write "800 watts" on their amp that does 100 x 2 @ 14.4 volts -- so they think it does twice what the SAX-100.2 does bridged. When, in reality, it probably does 2/3 or less in real life in an actual car.
It's tough to convince many customers... and even many shop owners of this. Simply due to the way the market it. I'm a small company I don't have to grow 100% sales every year to stay in business... I can afford to rate my stuff the way I want it. I plan to stay that way too as long as I can pay the bills //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif If I can't pay the bills and sell an honest product I'll move to a different industry rather than going the route of lying to customers.
I understand why US Amps did what they did... doesn't mean I like it or agree with it. But, the guy is right... customers will often buy the big number with cheap price regardless of what they are told by their dealer.