The Hex is 9Kg, the X8 is 10-12Kg. The guys I know flying LARGE X8's on it are in the 43kg range on a Naza 2. (They are not in the US so weight is not an issue)
I WAS a HUGE SuperX proponent. Loved them.. still love how they fly, but I take care of my stuff and the fact that 3 out of 6 are dead...