I just got a Lunasix 3 almost accidentally and thought I would give it a go (I invested in the battery conversion thingy and even the guy at B&H where I bought it thought the price was outrageous).
The meter is physically different from other meters I have used and I am not sure I am holding it right for incident light. Let's use a portrait example. Normally, I would hold the incident meter in front of the subject so that the dome is facing the camera. If I try to do this with the Gossen, I have to hold it horizontal and backwards. This doesn't seem right. It feels like I should hold the meter vertically with the dome facing upwards. But this doesn't seem right either. Also, there is one stop difference between these two methods.
I can do tests of course, but thought I would solicit some thoughts first from you folks.