It’s not obvious on the main site, but once you get to the configuration panel, Virtualmin is now one of the image options.
I like to think I had something to do with this because I lobbied Adam (the owner) hard for it starting about a year ago. I’d already installed CentOS myself and then installed Virtualmin on top of it, but I thought they should offer an image as an option for people who don’t want to bother with that (or who don’t know how).
As for the company itself, it’s a privately-owned company with their own datacenter in Latham, New York. I can say without reservation that they’re the best hosting provider / DC I’ve ever used. Great uptime, fast servers and connectivity, and truly superb support. I have nothing but good to say about them.
The fact that a small-time operator like myself can talk to the owner whenever I want to says something, too. It’s truly an excellent company.