Just thought that I'll post up
Right now I have i4, vio and grill.
I like both i4 and VIO, both awesome masks, VIO feels lighter on me because I have a wide face and i4 feels a little tight around the ears.
No problems with either one, VIO is a little bigger and I'm using it more often now, but both great masks.
Grill - I dont like the foam in it. For some reason it's just wrong, with VIO and I4 I can just put them on and I'm good to go, with Grill I either can't breath or it goes to much to my eye, and it feels heavier against VIO and I4.