Had a friend who used one for a few weeks.
Always had to be super careful with it and was always worried after the slightest bump that it was knocked out of place.
Sold the LRF and bought a monocular with LRF.
SJC
I had run a RIX L6 for about a year with external LRF it worked as long as you didn't bump it at all, I experimented with several different mounts. Now looking at getting a unit with internal LRF...