I have a laptop (Dell M6700) with Windows 7 Pro and have reserved Windows 10. I backup the drive with Acronis True Image. Once I have upgraded to 10 Pro, intend to image it as well. As long as only one OS is running, I won't be messing up any activation by bouncing back and forth, will I? Monday, Wednesday, Friday > W7 Tuesday, Thursday, Saturday > W10 Alternating Sundays > Ubuntu, Linux MINT
To me, it seems like a sound setup. Nobody will really know for sure until we finally get the RTM bits and see whats what. If you can wait, let others be the guinea pigs and do the testing for you Personally, I dont see you having an issue with doing that.