What are some alternatives?
When comparing Classic Shell and Open Shell, you can also consider the following products
Start10 - Start10 adds the familiar Windows 7 start menu experience to Windows 10.
StartIsBack - StartIsBack returns Windows 10 and Windows 8 a real fully featured start menu and start button, behaving exactly like the ones in Windows 7. It's totally awesome and easy solution for your new Windows woes.
Start8 - Start8 returns the familiar Start menu to Microsoft's latest Windows 8 operating system.
Power8 - Start menu replacement for Windows
Start Menu X - Start Menu X with Start Button. Power users know how inconvenient and time-consuming it is to launch programs from the system menu.
Start Menu Reviver - Free Download! Recover and update your computer with Driver Reviver and Registry Reviver. Easily update software, unlock new functionality and remove hardware device errors and clean, repair and optimize your registry in a few simple mouse clicks!