I'm running an AC110 and a small Fluval circulation pump on the opposite side (back wall). The circulation pump was mainly added to help with better distribution of CO2 throughout the tank. I also have some low flow from an airstone. I get it - Its a bit of an unorthodox setup for CO2 but I get the saturation levels and results I want even if it means shortening the time the CO2 tank stays full.
The left side of the tank where the filter is has pretty good flow, but its not uprooting plants and the fish seem to navigate it ok. I prefer to feed on the opposite side of the tank because the AC does blast food once it hits the down draft.
As far as performance. The AC 110 has been adequate for my needs. I am moderately planted, lightly stocked (plan to increase overtime with breeding), and heavy handed with food. I am trying out a plenum for the first time for beneficial bacteria, and am only using the AC purely for mechanical filtration. 7 months in, and I am very happy with water quality and clarity.
If cosmetics weren't important to me (its my living room display tank) I would have mounted the AC110 on the side and ran the flow long ways.