CBS4 v CBS5
I have flown both and currently own and operate a CBS5. In my experience the CBS5 does not have the shudder through translation of the CBS4. On approach you can completely ignore the shudder (as it does not exist) whereas with the CBS4 you need to modify the approach so as to shorten the duration spent going through translation. It also feels to me that the CBS5 has a significant power advantage.
They are a honey of a machine. Load them up with whatever you like and they just fly away. They are a fabulous hunting platform with the shooters opening the sliding rear doors and sitting on the floor with their feet on the skids giving a near 180 degree field of fire.
I have a grin from ear to ear every time I pull the collective!