I bought a Jeppeson Techstar on eBay for a much reduced price, but after the first few days of playing with it realised that the "whizz-wheel" is actually quicker and accurate enough given the approximate nature of forecast winds. I now use the Techstar merely to check my manual calcs if I come up with an unlikely-looking figure for drift etc. Mind you I am old enough to have used a slide-rule in anger, so that might have something to do with it!