Since I've had this sub for a little while now I figure it's time to give an honest review. Initially I was a little skeptical about this sub due to it's modest power and entry level price point. Thankfully I got it on a great deal that was hard to turn down, to my pleasant surprise it's one of the better entry level subs out there.
Looks
It's a sub and as most subs they're in a square box. It doesn't look like an elegant piece of furniture but it also won't take away from the look of a room. In short while it's not the best looking sub out there it won't get you in trouble with your significant other. Having said that it's not the smallest 10" out there, if space is an issue or you're looking to hide the sub it may not be the best option.
Performance
This is the area this sub shines, for an entry level sub its performance is quite good and surprisingly versatile. Although it has an impressive frequency range for a 50RMS 10", like most entry level subs it does become a bit muddy at the lowest frequencies. I've only occasionally noticed this on HT use, outside of the lowest frequencies it provides tight, accurate bass without being overpowering. For music it reproduces deep, accurate bass for a number of different genres. It provides depth and presence to music while allowing you to clearly hear what the bass player is playing. No LFE input is slightly annoying but is easy to bypass with a good receiver.
Summary
If you have a large room or 10K system this will not be the sub for you (unless you have 2-3 of them). The lack of power output will be noticeable in a larger room or working alongside large, powerful speakers. But if you're in a small to medium size room and looking for a great entry level sub at a low price point it's hard to imagine there is a better option out there than the Polk Audio PSW 10.