I just put in a REL T/9 in with my floor standing speakers. As soon as I can find another matching unit used im going to make it 2. Be hard to live without it now.
I am with a @knotscott: I keep the sub volume and crossover low.
I loaned a friend of mine an older Velodyne micro V for his modest system. At first he didnt like it. But after playing with it for a couple weeks he now confesses it would be hard to live without.
Its worth the effort and fun to try. Even if you dont keep it at least now you know. Satisfaction either way. Find a good used unit to try and then sell it if you dont like it.
It's akin to a foundation for a house. You never see it but if you take it away.....