I upgraded my SP3 I5 4gig 128g yesterday. It was a total non-event. The upgrade went smoothly and about 45 minutes after it began, it was running Win-10. Thanks to all of the folks on the Surface forum that spent many hours trouble-shooting the preview edition(s) for the time and effort they put into the project. Edge is a little disappointing - it doesn't utilize all of the hand/finger gestures that Chrome allows. Other than that all is good.