I just bought an RCS SIMtransmitter and just want to report that it works correctly on both 10.8 and 10.9 (with Heli-X v5). I bought the 4ch version so I can't guarantee how the 6ch version works, but I would be surprised if it didn't work similarly (at least the first four channels).
Picture of my unit: http://imgur.com/cektfdZ
This exact unit seems to be sold mostly in the nordic countries, but it could be useful to add to the list at http://www.heli-x.net/support_e.shtml anyway.
Installation and usage on Mac OS-X / Installation unter Mac OS-X
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