Its great! I actually preferred it over the Mesa Walkabout I also had on top of this cab at points; even though they both have semi-parametric capabilities, the TC was just much more controllable in the sub-lows. I do have some gripes about the RH750, but I still really enjoy it, on top of this cab, as well as on my NV610, and on borrowed cabs as well when I'm traveling light with my quieter bands. (The RH750 simply isn't enough when playing with my louder bands. For that I use my 400+.)
Its worth noting that this AE410 is also sufficient, volume-wise, under my 400+ for anything I need. The limiting factor of the RH750/ AE410 combo is definitely the head, and not the cab. The cab handles with ease much more than the RH750 can put out.
Lakland 55-64 -> Mesa 400+ -> Berg NV610