I upgraded to this helmet mainly for the MIPS system. This helmet is lighter than my previous Specialized model, my only issue is the back strap. It has two tabs(for lack of a better word) between the adjustments wheel that is annoying, but I forget about after a short while.
Spokane's review is right in line with mine A very good lower-cost (but not cheap) option for a quality helmet. It's a lower-profile design, nice and light on the head, with a true fit. The dial in the back is good quality. The only negative is the rough chin strap. Other models I've worn (e.g. Rudy Project), have a much softer material in their chin strap that add comfort. The strap on the Giro is a bit rough. Not going to ruin your ride, just a minor negative.
My whole family uses this helmet as our primary lid and we've always been happy with the weight and placementnumber of air vents. It is often hot riding here in Texas and we enjoy a helmet that doesn't smother. We just replaced my son's because he went over the bars. The helmet worked as advertised and took the impact preventing a concussion, at the very least.
I fell on my road bike when I slid on a muddy patch of road on a rainy day. My Giro helmet protected me as my head bounced along the asphalt. The side of the helmet looks like it was worked over by a power sander. The MIP System performed as advertised when my head twisted and rubbed on my left side. As I write this review I am ordering another Giro MIPS helmet to replace the one that saved my brain. This is the most important piece of safety equipment you will ever buy.
Let's face it, there are a lot of good helmets out there and all of them must pass the same DOT standards. The MIP System is a fairly new feature, but I consider it a must, since almost all cycling accidents involve lateral impacts. The Giro Synthe with MIPS also has a one knob adjuster that makes it easy to accommodate caps, sweatbands etc. For the price it can't be beat and it looks great.