Agreed. My two Fathom F112s have transformed my listening experience like no other full range speakers could ever do in my 14x17 room. I can enjoy bass down to 18Hz with no evils of bloat or overhang.
The speed and musicality of the JL Audio subs is a force to be reckoned with.
IMHO, the speed and musicality of a sub is very important with monitors as the 6-6.5" drivers are very fast and to be able to integrate smoothly, you need a sealed, fast and linear bass drivers that can only be controlled that well by adequate power. The Fathoms have 1500w each for plenty of control and overhead. When the music calls for that kind of deep bass, they will keep up without loosing composure or sounding thick or bloated. One of my favorite's is Haggard, talk about bass that will shake the foundation once in a while. Scary. But you'd never know the subs were in my system because they add virtually no sonic signature of their own. Takes some tweaking to get it to that level though.