Esper control mid and late game, after the threats have been neutralized and victory is probably assured, is fairly boring. Esper mirrors are mostly exciting in the last 3 turns, though Aetherling has the potential to change that.
Aetherling pretty much takes the fun out of any matchup... I prefer the old Tomahawk (Thundermaw Hellkite) as it generally leaves some chance. I have yet to actually play an aetherling from my RWU control. Also, I'm waiting for the Blas Act to drop in the upper panel.