I have one,.... personally I love RBH speakers, but I think you can get better subs for the money. As for the 1212-SE, it does a respectable job,.... but for the price???? If I were to do it again I would go with two SVS PB12-Plus/2.
On the other hand, if you need/want a small sub the 1212-SE is a pretty good choice, it has good solid output down to 32hz and still offers some good output down to about 25hz (according to some independent testing).