I do use the aero bars, but not very much. The only trip I've made with this exact setup (I change things all the time) was my tour around Lake Ontario in June. I'd estimate I used the aero bars for a maximum of 1% - 2% of the time, mainly when grinding into the wind on flat roads with little or no traffic. Sometimes I would drop down onto the aero bars for only 5 minutes in order to give my hands or wrists a rest with no weight on them.

I purposely didn't mount the forearm rests for the aero bars. The flat portion Ergon grips are in the exact position I need to support my forearms when I'm on the aero bars. The bag is triangular and my arms run right along the sides. It doesn't get in the way at all.

Even though I don't use the aero bars much for a hand position, I'm keeping them anyway. It's a killer place to mount my bike computer and my map holder (velcro straps).