Curious as well. I do know stay away from nemesis audio. The amplifiers do not make what they claim from the few dyno's that are out there on them.
Ruthless seems to make what they claim. I mean yeah dyno's are not the end all be all when used in RL. But it helps at least to me to see that they at least make rated or close to it vs some who claim 5k and they make 1k,lol.
From the pictures they look to be standard Korean stuff like Ruthless sells. Ruthless iirc was selling the 4500 for 799 or something. Might be worth looking at them. One dyno testing says SNI Build House same as the Salt Sundowns and a few others.