RoseHosting's service has been EXCEPTIONAL. I work for a small nonprofit and they helped us migrate over an old (10 years) MediaWiki install from a different provider, change all the PHP and Apache and Nginx and Varnish settings, then diagnose some server crashes (the Varnish cache ran out of memory), then helped us migrate to a new server with WHM and cPanel installed -- all included as part of our hosting package. Their pricing has been incredibly fair, transparent, and worth every penny for their professionalism and kindness.
It is very difficult to find a truly "managed" hosting provider that can actually provide configuration know-how and troubleshooting help, as opposed to just running pre-made scripts to set up generic installs. When most hosts say "managed," they mean "We'll get your bog-standard Wordpress install up and running", but when the server configuration gets even a little bit complex (as it necessarily does with a decade-old MediaWiki install running old PHP, MySQL