This helmet fits great. I had to remove the extra padding in the chin bar to fit my skull. The only issue I have with it is that the bite valve from my Osprey hydration system doesn't fit too well underneath it. May need to rethink my bite valve.
After watching my 6 year old son take a horrific fall in the local pump track we upgraded to full face helmets for the entire family. I've also had nagging jaw alignment issues after a spill years ago and decided it's worth having a little extra protection. This helmet converts quickly so I ride uphill without the face mask and strap it on for the descents. I mostly ride single track trails in the Truckee/Tahoe/Reno area. It wouldn't be my first choice for the Northstar Downhill Park but for anything you pedal up this helmet's ideal.
Fit snug on my head even without the strap cannot shake it off the mips system is worth the money and like I said Best of Both Worlds downhill won't bust your teeth out cross country lose the chin guard.
Use this when mountain biking and gravel. Like the ability to remove the chin guard while climbing, or when gravel grinding the entire ride. But have the additional safety of protecting my face on the downhills.