get a flex-7, brilliant masks, all the frames/faceplates/ear protectors/straps are interchangable. you cant however switch stuff apart from straps between a flex-7 and flex-8
Been using flex-7's for years, good vision, no problems in my experience, and the first time you get a ball bounce off your face-plate is brilliant. That said, I would strongly advise against the flex-8's - my team-mate has one, not flexible like the flex-7's, more like an old spectra. Not impressed at all.