i'd say is a very good amp and for the price is good. You will see decent quality and real output. They're very cheap on ebay and kevin holden sells them.
Lets just say......the amp is nice as the nine1. Definitely better than hifonics amps. When Julio said decent quality and real output heres like in lames terms. They rated the amp at 14.4volts, but at 12.4 volts it puts out 1250rms (around there). In the end just consider it a 1250rms type of amp and compare the prices to other amps in that power range. Such as the nine1, which puts out 1200rms at 1ohm on 12volts or so but puts out 1400rms-1500rms at 14.4volts I heard. The Massive Audio is like that just that they rated the power at 14.4, not 12.4. Hope you understand! But for the extra money I'd get a p3000.1, you can do 1500rmsx2 at 1ohm or 3000rms x 1 at 2ohms.
thats good to know that the other amps do rated power at 13 volts =). Would be nice to see the 3000 do rated power at 13, then I would have no problems keeping all that power.