The website doesn't inspire confidence, but the project appears well maintained, and even the GPL version (which I use) is very capable and has so far been rock solid.
We're not very good designers, I'm afraid. We're aware of our deficiencies in the area of UX and design (in Virtualmin/Webmin/Cloudmin themselves and the websites), and have been working hard on a new design for Virtualmin (with outside help). It's slow going, due to the size and complexity of the codebase, at about half a million lines of code developed over 14 years, but it is happening. But, as you note, it is definitely well-maintained...we do a new release of Virtualmin and Cloudmin roughly monthly, and a new release of Webmin every couple of months.
I'll also mention that we have an active community of several tens of thousands of users, and a full-time person working on providing great support in our forums and ticket tracker and on twitter, so it's usually very easy to get help, whether you're using the Open Source version or the commercial version.
And, while Virtualmin is lighter weight than cPanel, it does quite a bit more, particularly for developers and technical users. Being Open Source, the types of folks who use it tend to be a lot more demanding of some types of functionality and behavior (like being able to edit config files outside of Virtualmin). IPv6 is one example of our users being a lot more demanding and technically advanced than cPanel; I'm shocked they could hold off this long. We were being hounded at conferences and in our forums about the issue years ago.
that's the status view in the system information page.