I took the leap and upgraded my laptop (Sony Vaio) running Windows 7. I like the look of Windows 10 but I immediately had problems with my Apple products (iPod touch, iPod classic) that I use to download 800Gb of audio files. Windows 10 did not recognize any of them and I couldn't sync. I can fix fairly basic problems, but this one has me flummoxed. I don't know anyone who could help me fix the problem and the fixes I tried from investigating on the Internet didn't work. Or else I'm just too computer stupid to figure them out. I deleted Windows 10 and went back to Windows 7. One thing I didn't notice (in the fine print) is you have 30 days to swap back to a previous version, then Windows 10 dumps the files to run your old version. I, as usually happens, didn't try to go back until the 30 days had elapsed. Good thing I back up my entire computer to an external hard drive. Still, it was a big PITA to get my Vaio back to normal.
