Got it from the factory with a liquid flatlock and cutaway chin cup. At first I thought I needed to size up but after some breaking in it's now fitting perfectly. The cutaway chin cup is awesome and saved my neck once already. Its nice for speed flying and in the plane to hear people. I don't think this is a loud helmet even with the vents. One day I bumped the top of my head and I felt a sharp pain. Pulled out the liner and discovered that the snap screws in the factory installed flatlock had sharp edges and protruded more than necessary. Would have been nice if they had filed it or used another snap screw. Also they "forgot to ship my order" so it took them several months to get it to me.
All in all a great rig for camera flying, super stable and worth the hassle. Just wish they had done a better job installing the hardware