I am using site5. So far so good. I have a buddypress multisite on their shared hosting service and working just fine. Just installed today, so I have not tested everything yet.
I had a 500 internal server error, but turned out to be my .htaccess file and site5 found the error when I missed it.
Well I am kinda where you are….I used add_theme_page and now I have a privacy settings page under my theme, and I can save.
but the only thing that appears to do anything is if I restrict the entire site to logged-in only users. On the members page I can get the settings to save if I apply globally. But it doesn’t seem to do anything. not yet anyway.