They are fine. Not extraordinary, but not bad either. Like everything Sonance makes- you can find something that outperforms it and plenty that don't. I did a builders own house and used four of the Impact 12's in his media room, and it sounded great. I've used the D8 in a place where it needed to be hidden in a corner behind a chair and it did the job just fine.

Do you do a lot of business with Sonance? If so, then I would use them. If not, I wouldn't seek them out just for freestanding subwoofer product.