It's pricey, it limits you to 1 pad size, although at one time there was some kind of Edge deal where you could use their system but Edge seems to have died on the vine and everybody uses MF pads now anyway. Also, I think it has that same goofy counter-clockwise rotation that Flex uses and I hate. I guess if you're a southpaw it works great.
For the money - Rupes
It's pricey, it limits you to 1 pad size, although at one time there was some kind of Edge deal where you could use their system but Edge seems to have died on the vine and everybody uses MF pads now anyway. Also, I think it has that same goofy counter-clockwise rotation that Flex uses and I hate. I guess if you're a southpaw it works great.
For the money - Rupes