"Absolute best" at doing what?
I really doubt it is the 'best' in any helmet category...aerodynamics, protection, ventilation, fit, price, etc. It is a really good helmet though. I've spent the last 10 years in Giro helmets and I like them as well as any I've used.
But, to call a helmet 'best'?
Pretty much all the players manufacture some really nice head gear these days. I despise the look of Smith and POC helmets...among several other brands that are almost equally fugly to my eye, but I would think that ugly as they are they have all passed the same tests...more or less. There were two major names had to recall product because it actually did NOT pass the CPSC tests in all categories.
Catlike...could a helmet possibly be any fuglier? Yet it has been used by riders that have won just about every major ProTour race...it's as good as any I would wager.
If the looks and features of the Synthe put smile on your face, go for it! A helmet that is well liked is a helmet that is worn.