On Saturday, September 17, 2016 at 5:12:54 PM UTC-4, wrote:
I own a CNv and installed the latest software updates. I also have experience with an Air Avionics Butterfly. But I did not use both varios at the same time.

CNv wind calculations became quicker during the various releases. But in my opinion, it is still slower and less reliable compared to a well compensated Butterfly vario. You will notice the difference especially when flying straight.

The Air Avionics system has a much higher resolution of small wind changes compared to the CNv and it does not need changes in direction for wind updates. But you need to spend some time in setting up the Butterfly sensor unit until it works well. If you did so, it can be very helpful to find lines of lift. I find CNv wind speed calculations sometimes to be inconclusive (too high), but perhaps this is related to my setup.

Great opinions...thanks for contributing. Keep them coming.