Haven't tried the Crye, but I have tried the others. The Litton and Norotos facemasks are good for heavy units, such as the PVS-7, as the cheek pads spread the weight around a little. They do get in the way of a good cheeckweld if you're using a PVS-14 over one eye and trying to aim with the other, though. The
Norotos packs down smaller but is quite expensive. Also, the rivets are soft (brass or aluminium?) and stretch if you pull the straps too tight.
I'm going to give the Crye a try as soon as I can get my hands on one, but I thing the Litton/Norotos will still be the go-to mount for heavier units. That said, any helmet beats the living daylights out of any of these, with the added bonus of actually protecting your noggin. Especially when you're getting used to NV you WILL keep bumping into hard/pointy stuff in the dark.