A buddy of mine works for the big O and he bought one. He said it works fine. The dongle works on the later GCS. He said the software on the first GCS's would blow a fuse or shut it down if you used the dongle. He uses it on all Otis equipment. Gamma D, 211,311,335,411, gems, gen2 and gcs. Not sure about the hydro fit but if it works with all that I'm sure it would for them as well. He bought it so if he left, it was his.
