In today's Adventure Pilot Newsletter email, there's an excellent video by Brolin about the Winds Aloft display. It's succinct and informative--and it's about one of the many really cool features of iFly that aren't necessarily obvious, especially to new users.
It's helpful in planning a flight--but in the video, Brolin points out that Winds Aloft "give[s] you up to the minute both winds aloft and forecasted winds aloft...." That makes an important distinction between actual and forecasted wind info. (He goes on to recommend updating the winds to be sure you have the most recent data.)
This means that if you're flying into a headwind, the Winds Aloft display may show you on the fly that at a diffeent altitude you might have a tailwind. It took me a long time to figure that out for myself--and even then I didn't think about how old that wind data was. Later I realized that my cellphone could update the winds in flight if I wasn't too high. And now with ADS-B weather it's even more likely that the actual data are current.
I've used the Winds Aloft feature many times to pick a more favorable altitude, and found that it usually saved time over ascending and descending while comparing ground speed with airspeed.
So it's a great feature and a good video.
The only thing Brolin left out is another great hidden feature of iFlyGPS--that the winds aloft slider control is movable, easy to drag around the map so it doesn't cover up something important.