Anyone used the redrock with the 170?

Just got a 170 and am trying to figure out the best adapter to use for it. I'd like to use the redrock because i like their shoulder mount and follow focus, and mostly because people are selling whole M2 rigs cheap. Are there any bugs with that combo and how does it work? Also what should the iris setting be on the camera?
 
i use my 170 with my brevis and it works great. dont know why a redrock would be any different...
 
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