Yes, I was a Webmin user before beginning to work on it, and I continue to use it (and Virtualmin and Cloudmin) daily, fourteen years after I first installed it

Yes, I was a Webmin user before beginning to work on it, and I continue to use it (and Virtualmin and Cloudmin) daily, fourteen years after I first installed it; it's been among my most consistently used tools, alongside vim, bash, Linux, Apache, Postfix, Perl, and Python (roughly in that order of usage) throughout all of that time. I don't use Usermin as much as I used to, now that there are vastly better webmail clients (GMail is damned hard to beat, though now that I'm taking encryption more seriously and there isn't a good client-side encryption option for GMail I'm back to using Thunderbird for most mail tasks)...but, we're working on fixing that problem, so might begin using it again as my daily mail client within the next six months to a year.