I have it and it is plenty powerful for everyday usage. For example, I went to a drive-in movie (yes, an ACTUAL drive-in and saw Wreck-It-Ralph and Frankenweenie). Those around me actually turned off their radios and listened to MINE (doors and hatch opened), as it was an FM radio-broadcast movie audio.
The guy next to me used to build audio systems for pickup shows and he was impressed w/ the little 8" and what is basically a stock system (I have stock fronts in the rears for now).
I actually usually run it on a fairly low setting (little extra bass) and it balances well.
The biggest advantage to that unit is that it plugs into the factory wiring and mounts, with 2 holes cut into the plastic-> one for a mounting bolt and the other for the wiring to pass through. All else is "plug-and-play" even with the most base factory headunit, as I am using the base 09 headunit on my own xB.