I've got one of these and they are a fantastic product, made with care and quality. You can see my review here:
Alpha434's redesigned Vents Armor for JT Modding
They are about the same weight as proflexes - very, very light. They have a ton of soft protection around the sides for deflections, but don't have the slapback or face-spray problems that I've had with every other mask when you get a grill shot. The vents go sideways, so you can't really get paint in your mouth on a direct shot.
Can't really recommend them enough.