After using debian since 1996 or so, I finally got tired of waiting for the next stable release, and upgraded from sarge to hoary when hoary was released. The upgrade went smoothly, although it required some messing with apt pinning to downgrade some packages to the official supported ubuntu versions. In general I have been very happy, Ubuntu is very polished.
The one thing that really annoys me though, is that a security update to kdelibs-data was broken (couldn't be installed since it conflicted with the knetworkconf package IIRC), and AFAIK they still haven't fixed it even though it was something like 3 weeks ago.
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