Richard:

I've only ever tested the rear location. I mentioned to the builder off-handedly the desire to have 2 locations, but that option did not get into the planes until the actual production run so I never saw it, and he didn't tell me he had made the change.

If it works like it did on the Extras and Edge, the front location will 3d better, rear location will be smoother and better for IMAC.

TF