Loving my band, but am having some issues with Cortana and syncing. Texts have about a 50/50 chance of working, or giving some kind of error (make sure phone is close, lets go to your phone to finish this, etc.). Looking up simple things and setting reminders is much the same. I discovered I greatly improve the accuracy by unlocking the phone on my desk first, but this kind of defeats the purpose of the band. I imagine some of this must be because of Windows 10 Preview, but I'm curious if anyone else is having some issues with their bands and the preview?