Any thoughts or recommendations regarding the Emotiva SE8 or REL subwoofer?

Thanks for any feedback on the above. I currently have the Maggie LRS which I am most pleased with, and am not overly concerned about  the limited low end response. I am curious, however, about what may be gained by adding a small sub to the system. I am not a bass freak, and would be more concerned about integration and overall balance. Thanks in advance for any comments / recommendations.