I can say that hostingsource.com hosting and also managed services are professional. Uptime has been good.
I've been using their services for not so long and must say that everything works fine. Customer support always answer my questions with helpful explanation and good recommendations what to do next if the problem exists.
I did have one billing issue with a new service. Hostingsource resolved the issue very quickly and most satisfactorily.
I like this web hosting provider and highly recommend its services.