The most important things about a helmet are the fit and function, both of which POC nails. Also, I have a Synapsis 2.0 and it looks fkn awesome.
POC also makes helmet shapes for round AND oval head shapes, so def try a few on and see what works for your dome.
"I know you believe you understand what you think I said, but I am not sure you realize that what you heard is not what I meant."- Alan Greenspan