OP, I did get my two SB-12's hooked up and listened to them in my space last night. Overall, I thought it was pretty good. No, it wasn't OMG crazy bass, but when listening to industrial rock (Celldweller) or Eric Clapton, the bass filled the room and sounded wonderful and clean. Sorry to say this, as I know movies was your main concern, but have not tried movies as I don't have the TV mounted yet. I will say in my testing in another location that had more area, a single SB-12 produced some nice bass with movies.
I played around with one sub vs. two, and which sounded better, the corner loaded unit in the back or the front unit. Beyond the extra output, the second sub evened out the response in the room. Alone, the corner unit produced a little more output, but was somewhat directional. During music I could tell it was coming from behind me instead of the front. All of this is to be expected of course, but I thought I'd share anyway.
I know you would get more bass out of a larger, ported unit, but for the size and cost, I was impressed. Beyond that, my wife is happy.