Yes, just prior to the upgrade (and reason for) I got a new Iphone.
Before, when using the Samsung, I could make it work, marginally, if I jumped through a lot of hoops prior to flying, ( GPS and WIFI off, cacheing off etc.) and even then occasionally I would run into performance issues, such as lagging, pixelation, and sluggish or no command responses to active track, etc.
Being a long time hold out, I hate to admit that now, using the Iphone it is flawless.
But, again, in the interest of full disclosure, I was using an old Galaxy s4 and I have no idea how well the newer Andriod devices handle it. Given the evidence supporting the IOS, I just wasn't willing to risk it.