Get the Aether. I have Synthe and been waiting for a decent deal in the colors I want. My Synthe fits like a glove.
Just like Minnman I crashed my bike in Sept 2018 and they gave me 30% discount for a new helmet. However, the deal was for most helmets excluding the Aether if you are in the US. I guess they don't like giving out the good stuff for cheap.
I also purchased a Bontrager Ballista last year but never liked the fit. Maybe Giro's MIPS system is a better fit for my head shape. It's also heavier than my Synthe. Maybe that's one reason I never really liked it.