Can't speak for the 12, but I have the UFW-10. After hearing it in my system, two of my buddies bought 'em too. It is a very musical sub and the single band parametric EQ lets you dial it in perfectly. The 12 with the R-DES should be even better. I am using the 10 in a 16 x 26 room with Reimer McCullough GSes and it is excellent as a music only sub. The UFW-12 will probably give you that extra slam you would need for movies.
Oz
Oz