For the 50$ I spent on it, I don't think you could ask for more. There's not a lot in the way of frills, but it makes good clean power, and seems to work well. I have it running 2 10" Infinity Subs at 2 ohms each, and it puts out a respectable amount of SPL. Eventually I'm going to upgrade to something with more power, but for now this amp works really well. Pioneer makes good products.
For what it costs it delivers. I wasn't looking for a bump that the whole block could hear or anything but enough that I could hear it and feel it and it kicks good.