1. Arai Excellence
Total winner on all fronts. Fit is spot on in medium for my 57cm intermediate-oval head. The fit and finish are A-1 top quality. Shield mechanism is not hard to figure out once you know - just flip up with your thumb on the mechanism and then up and out with the shield. Changing the shield is *far* easier than ever before on an Arai and no issues whatsoever. I installed my Sena 30K without issue. Extremely happy with this helmet wearing it around the house - can't wait for warmer weather to get out and ride.