I've heard Polk Audio is a decent brand, but I'm not entirely sure. A friend offered me his, but I wanted some advice. Other than the grills, I like their look. But more importantly, does Polk's subs sound alright and is their rms rating accurate? http://www.sonicelectronix.com/item_19257_Polk-Audio-db1222.html?from=857-49 Thoughts and suggestions?