1) Fit: I measured my head with a tape measure and the size was medium. Well, traditionally I'm not medium in anything, so I went for the large. Fits perfectly. 2) Function: I tried setting all the buttons and they worked fine. The quick release chin strap works very well and is very easy to find when putting the helmet on. The fold-down visor doesn't cover the entire field of vision, but it's enough to keep me from needing sunglasses on a very bright day. 3) Noise: The level of wind noise was within acceptable limits for me. Definitely quieter than without a helmet but still lets enough noise through that I feel like I can hear my motor well enough in case of deviations. Conclusion: For the price I can't complain about this helmet. I'm not sure what other people expect from this, but I think it's a really good deal.
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