Hi,

I've flown both, CNv XC and Air Glide S (aka Butterfly Vario). In terms of wind indication, Air Glide S has far superior capabilities. I don't know any instrument in gliding that has the same speed and resolution of wind vector and speed.

However, the sensor unit needs to be correctly placed and well compensated. This may require quite some effort, especially in motorgliders with a lot of cables and metal in the fuselage. But probably the same applies to other AHRS units.

Best,
Christoph