At first glance, I would give this helmet a 10 for style. Once I took it out of the box, though, my excitement dwindled. My first issue with the helmet was the height adjustment tab. For such an expensive helmet, the plastic piece is flimsy and snaps in and out of place for adjustments. Once it is snapped into place, it is very difficult to remove, if you're not careful you will break the piece. My next problem is while actually wearing the helmet At speed the air rushing into the large scoop at the back pulls the helmet away from your head. Very poor design. The only way to alleviate this problem to some degree is to wear a thin skullcap or sweatband like Headsweats as you can tighten the securing nob for a better grip. Lastly, for a manufacturer of sunglasses, I am disappointed with how I am unable to slide my Oakley Jawbreakers into the air vents when not in use (they do not secure nearly well enough and WILL slide right out the moment you tilt your head forward). So, taking these issues into account, it's a great looking but rather poorly designed helmet. For the price there are better quality options.
I will start by saying it allows a great amount of air flow for an aero helmet. The weight of the helmet is slightly heavy, but you do not notice it is on your head while riding. The Boa fit system makes this helmet easy to adjust on the fly and use with any type of sunglasses. The downfall is the price compared to the competitors in the aero helmet line. BTD is the cheapest place you will find this product and that is what makes it a good deal.