[stinkytaco]

It's the second biggest Linux company behind Redhat, so I think it's reasonably popular. It's also been a while since I used it, but I'll also point out that it's developed primarily in Germany, so it's entirely possible it's just not as popular in the English speaking community.

However, the licensing agreement with Microsoft put many people in the open source community off, so I think that's contributed to its decline among hobby users.