The biggest problem with Microsoft Windows 10 is devices and application having issues though users should be getting an advance warning of issues when the update generates a compatibility report . Windows 10 starts faster uses less memory and is been taught new tricks like compressing the memory on the fly that Windows8 will never learn . Yes some users on some devices and machines upgrading to 10 for more functions. Windows 7 and Windows 8.1 will be loosing key futures if they upgrade to Windows 10.