I've owned several Profile amps. A couple of the SX-series California amps (the older blue chassis units) a CA and a couple of AP-series California amps (the newest brushed aluminum-finished chassis units) and one Clarus amp.
Bang for the buck they're really tought to beat. The cosmetics on the Clarus amps are a bit questionable to me but performance-wise I had no complaints at all about any of them.
GD There are like 8 threads on these amps. Yea theyre good for low entry level. For the money you wont find anything better. Good bang for the buck. Tend to get hot quick.