I purchased this amp and have had it in my 2005 Impala for 1 month now. It is powering 2 12" MTX Terminators, and it slams! Although the specs online say the amp is rated for 500 Watts RMS, my amp came with a spec sheet stating that the amp was tested and provided 642 watts of clean power at 2 ohms. For the price, it is one of the best amps available.
The amp was very easy to setup. The only issue I had was when I was trying to fit the 4 gauge power and ground wire into the terminal block on the amp. I managed to get it to fit, but the terminal blocks are angled down. Due to this, it is difficult to get the wires to fit once the amp is mounted to the sub box. This is a minor complaint, because once the amp is connected, it is easy to tune and it works great.
Also, the included dial works very well, and is useful when you simply want less bass without having to adjust the gain dial on the amp.
Overall, this amp works very well. I have not found anything better for the price. It provides much more power than it is rated for, never gets warm, and is built very well. Personally, I highly recommend it.