I had the Chameleon 4 and loved them- but wore them out.  For a replacement, son of, but why does it make a crunchy sound when I walk??? As long as you do not work in a Church, Funeral parlor, Spy, or the hate the sound of yourself around the house it’s Okay.  I guess they called it Prime and not Chameleon 5 because of the big so called shoes to fill . I use to hear all the Chameleon 2 people rave. Big shoes to fill.