I have one on my RV-6 and it's worked perfectly in the stock tail-light location. My only concern with it is damage due to people walking by, or swinging my tow bar without looking. It is very close to the angle my tow bar is at when i'm turning the tail.
The original design had the plastic enclosure extended to cover the two antennae, I would be a lot happier if they had retained that design but they said it was a nightmare to assemble compared to this one.
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)