Yes, most of us know that the penetration is zero, because no one has gone beyond beta tests, field tests, license agreements in 2006, 2009, 2010, and 2016 all that have gone nowhere and/or have not gone beyond development stage companies/products yet (2016). I believe most understand stealth mode is a misnomer for failure to launch. Better yet simply another spin story like the 10s of millions endpoints VLDI was going to get by signing smart phone service/solution providers directly or was it the 250,000 mobile App programmers that were going to include it in their Apps. I guess they are having difficulty in getting past the brick wall of competition therefore no penetration, just bruises from banging their head against the wall.
