I have one. I have been happy with the winds and from what little I can tell they seem to be reliable. I love the A/H and it seems really accurate and real-time to current glider flight conditions but don't do loops with it! Messed mine up for the rest of the flight.

Here is a video example of what happens when you do loops with a Butterfly Vario until they get some sort of an update to fix the problem. The loop is around 5 minutes in:

http://youtu.be/_lDU42C7lFs

All told, I have enjoyed the unit and the factory has been good to support it so I am sure the loop problem will soon get fixed.

Bruno - B4