One fantastic thing about the new tank setup vs the old one is running the rollermat directly off the overflow. My previous configuration had a pump feeding the rollermat from the sump. It was so much less effective. It did not take long for buildup of fish turds everywhere in my sump.
Now that I'm running this new configuration, my sump is slowly cleaning out (I kept all the detritus in the sump when i re-plumbed everything), everything is staying clean, as well as getting cleaner from moving the old detritus out over time. The other benefits are electricity savings from reducing a pump, slightly lowered water temps, general simplification, and reduction of a failure point.
Another very valuable thing that I have learned from running a rollermat, is that you want to run very close to maximum water flow rate. In my opinion, this is the only way that you will effectively reduce nutrients in your tank. My reasoning is that the wheel on the filter is so large, it takes quite some time for the filtered nutrients to leave the water column. Way too long IMO. By running at max rate, I cycle through much more filter media and quickly remove everything out of the water. My present suspense is about 1 day. The other fantastic benefit is that my skimmer runs much cleaner and more consistent. I haven't even cleaned it yet, since re-plumbing. It would have gunked up much sooner that that. I'm very happy withe the results from that.
I gota say... I love this thing even more than I hate filter socks. I will likely never do another tank build without one (or a variance of one).
Now the tank will only get as dirty as I want it to get!