I finally got around to make another flight to test Smart Glide. I will update this post with a video as soon as I have gotten a approval from the authorities to share this video. (it should not contain anything secret but you never know ;) )
Basically it works as advertised but I´m not so sure it is useful in most scenarios. I will use it if I have engine trouble at high altitude in IMC, for a short while, while I organize myself before manually setting up for an approach.
It has a lot of potential for improvements that could make it close to as useful as Auto Land. The system has all information needed to create and let the autopilot use a visual approach guidance to a runway threshold, using the sink rate you have programmed and accounting for wind. All the pilot would have to do then is to make a final flare :D
Updated with video:
