Vents work well for cooling my head, especially since it replaces the $20 Bell I was using before. Fit is great, even better than the Ionos for my head.
Wish the locking mechanism was more like the more expensive helmets though. When trying to tighten the dial, it is easy to hit the release button and loosen the helmet. I find it to be a bit awkward to use. Once the size is set, I have no complaints.