I would like to hear from those of you who have or had the Ultra-X12.

What was your thoughts and experiences with this unit? Music and movies.
Did the Ultra-X12 replace an existing subwoofer? If so, how did it compare?
Any issues with the unit?
Was it a keeper or did you return it? If you returned it, why?
Would you recommend the Ultra-X12? Why or why not?

Thanks in advance for taking the time to reply.