i`m looking at going straight gas on the 350 in the HK

i`ve been offered an OHG X-450a mixer & an X1 converter at a very good price.there are some good write up`s & reviews on them,a lot saying they`re the best mixer out there

is anyone in fastlane land either running this set up or had first hand experience with them ?
are they as good as they`re made out to be ? what do/did you think of them ?

cheers
jason