hmmm well havent used the flex 7's but had some proteus for a while, they were quite good but very hard to get the lenses out to clean, plus i found it hard to hear ppl that well in them (probably just my big ears). Changed to Vforce ones recently for obvious reasons, and have to say they are excellent, they never fog, great field of view, comfy and the bonus is i can get the lense out in seconds to clean. Plus i can hear ppl in them so am gonna be differenet to everyone else and say Vforce all the way!!!