In the SPL world, they are mainstream. Hop on caraudio.com (more SPL oriented) and search for their amps. They're all over the place.Dude, dont listen to them HIFONICS IS THE ****!
Ive used hifonics in the past. there stuff is awsome. Its just not manstreamed. Ask anyone at any soudoff competitions and they will tell you to get it, great deal on it.