I'm sure different people with different riding styles and different road conditions and terrain will feel somewhat different about it. If we knew what your riding style was, terrain conditions, what type bikes you had previously that you liked and whether you want to be in the fairly aero position that you'll have on the Aethos, then maybe you could get a answer better suited to you.

I like my Tarmac, I'm pretty sure I'd like the Aethos. Aethos is a tad lighter. So maybe I'd get a few more personal KOM's. But maybe not enough weight difference to be an advantage against other bikes with more aero frames on really long rides.