i've had the following -
Dye i3's
Flex 7's
Flex 8's
Profilers
i found the dye ones to be a little tight around my nose and also had darker vision as the lense is smaller so it let less light in.
the flex 7 and 8's are pretty much the same and allow alot of light in and are nice and spacious inside, although they don't feel as surcure (spelling?) as the dyes.
over all i found the profilers to be the best mix between the two.
nice and comfy , held on well and lots of light let in.
At the moment i'm using flex 8's, but hope to buy some profilers or maybe try some grillz.