Neither have we.
I recently had a GC's wife (real estate agent) complaining about the receptacles breaking up the backsplash. She asked if I could put the plugs up high on the next one. I said I could but then you would see cords hanging down. Six of one have a dozen of the other as far as looks go IMO but hey, I'm just the electrician and as long as its legal you ask you get.
With that in mind this product looks nifty if your not doing UC fluorescents as well.
It seems to slide over a stub and meet the wall, exactly how I like to do my UC's.
I'd like to see a picture that shows how they mounted their UC's.