I would say that RoseHosting has provided a quality and reliable service at a reasonable price. My experience is that of a small business (brittfranken.com: photography). I have not tested RoseHosting VPS with regards to scalability (yet). With that said, for small businesses, requiring a certain technology freedom, RoseHosting VPS is a great solution.
Beside the fact that your servers 'just work' without talking much of my attention away from the work I want to concentrate on, your support has been more supportive than I expected. Normally I would assume that with a VPS I am on my own with the administration of that server. So I was reluctant at first to ask a question that the root admin should know, but you helped me out very knowledgeable. I got more than I expected.