“Have you used Open Shell? If so, any problems?”
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Installed in Win 8.1 yesterday, so far no problem. But if Classic Shell caused problems for you, you could possibly also experience issues with Open Shell since they’re basically the same program at their core.
if you try installing it (or any other program for that matter) it’s always a good idea to make a restore point and/or backup your registry beforehand, so you can undo any changes after you uninstall it (if it doesn’t work/causes a problem)..
I'll try it in Win 8.1 and save the Win 10 installs for later. The real test will come when a Windows update finally breaks Classic Shell.