Subwoofer to go with Wilson Maxx II's

I'm in the market for a Sub to compliment my Maxx II's. I thought I wanted a powered Watchdog-and still may. I read a review that said it may be-choke-inadequate. Never thought I'd hear anything written about Wilson's with that word in the same sentence. In it's defense, reviewer was referring to below 20hz sound in home theater. I like movies, but my main emphasis is music. Any recommendations or comments about the Watchdog?