Some thoughts:
Don't plan on Levil's thingies getting on the market very soon. Often the announcement of a new avionics doodad is literally years before it's certified, and often even longer before it's available. That's true of all kinds of avionics and instrumentation.
If I was in the market, I wouldn't even consider anything by NavWorx. Their tussle with the FAA is costing a lot of folks some money, and while they have some items that apparently aren't involved in the tussle, dealing with a company that infamously butted heads with the agency that holds the cards doesn't seem very smart. But that's my opinion.
Having had ADS-B Out for the last 1 1/2 years and ADS-B In for about 4+ years, I have to say it's marvelous technology. Not that it's a particular game-changer, but it's great to see other traffic and to be able to identify their tail numbers, altitudes, and direction. It's great to get verbal and visible warnings when they are close enough to soon pose a danger. It's even greater to keep tabs on the weather, soon enough to make a Plan B decision.
Gosh, the times they are a changin'!
Cary


