I upgraded my laptop to Windows 10 today. I used the Windows 10 upgrade media creation tool to create a bootable Win10 USB drive, and then ran the upgrade application straight from within Win8.1. Everything works fine so far. Cortana is a little bit finicky and I’m still learning some of the features. I’m liking how snappy everything feels though. I did an in-place upgrade. I might do a clean reinstall in the future.