I had been using a Savant MIPS, upgraded to the Synthe MIPS when there was a sale, and love it. It's so comfortable I hardly even think about it while riding, other than occasionally adjusting the micro adjuster, which I can do on the bike. The micro adjuster is extremely handy to compensate for the change when I put a skullcap on or off in the winter. I also like that the height of the rear band mount is adjustable, easy to get the fit snug but not tight. The sunglasses dock seems mainly useful for pros (who have sunglasses sponsors) or folks who wear cheap sunglasses. Me, I need glasses to see where I'm going so (a) I'm not going to take them off while riding and (b) even if I did, they are Transitions Progressive lenses, which are FAR too expensive to risk leaving perched on the helmet where they might fall to the ground if I forgot they were there when I removed my helmet. And if they fell off and broke, finding my way home would be a problem! So I just keep my glasses on and fasten the helmet straps over them.
I first bought Dual SL2 sunglasses a few years ago when I was having trouble reading the smaller numbers on my bicycle computer and iphone. They are light weight and have good optical quality, but eventually the small wear-and-tear scratches have led me to buy a new pair. Same product. I rarely ride without them.
All aspects of the construction inspire confidence. Size M fits me the same as several other Giro helmets I've owned. Visor snaps securely with magnets, including upside down for warmup. I will try swim goggle anti-fog stuff next time as visor fogged up on a max effort 35 degrees F day, damp but not raining. Tinted visor is fine on a gloomy March morning. Won't need the $60 special order clear. Short tail, sits nice and low for my position. Did the research, don't think there's a better TT lid out there. Ultimate version is practically identical except it has no (!) vents. Would be smooth and easy to tape the vents on this version (to save what 2 secs over 12 miles?)