Looks like a good deal. I had an Aethos Comp (with a few upgrades) for a couple years and absolutely loved it. It was light and handled really well, and the ride quality was exceptional. Race bike geometry with endurance bike comfort and compliance. The only reason I sold it was because I bought a new Tarmac SL8, and while they are definitely different bikes, there was too much overlap for me to justify keeping both.

I ran Roval C38's and had no issues with them. They were a decent combo of reasonable weight, aero, and durability. But if were to own another Aethos (which I may someday) I'd do as you're suggesting and go full-on lightweight climbing bike with Alpinist CLXII or something similar in the 1200-1300g range. That would be a fun bike.