The O retailed for around $180, IIRC...so you're getting a hell of a deal. I own the next step up from that, so I sort of know what I'm talking about...maybe. //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif
There are other perfectly good drivers in that price range - Shivas, Type R's, Comp VR's, others come to mind, and I've heard most of 'em. The O will kick those drivers in the dust for SQ, but since those other ones can be ported, they have the output advantage. But as you said output wasn't a big concern...