On Saturday, December 30, 2017 at 9:57:00 AM UTC-8, wrote:
Actually, I find the second vario quite useful. In straight flight I have my V-7 set on netto, but when there's a mild surge it's always a question, is this an actual thermal or just a change in air movement? The Winter tells me right away, and I can make a quick decision: turn or keep going.

A Winter variometer cannot tell you anything "straight away".