MadPenguin has made a comprehensive test of Dapper Drake and are extremely positive.
The three-page review starts here
All in all, Ubuntu 6.06 is gearing up to be quite an impressive release. Granted, I saw some bugs during my stay on the distribution, but can I really complain? It's not a full release, so it deserves some breathing room. Considering some of the horribly authored software I've looked at over the years, I feel that Ubuntu in pre-release form is more stable than other distros when they reach final release status. It's not quite in the league of Slackware and Red Hat/Fedora in that respect yet, but it's surely getting there in a hurry. As I said before, it smoked Fedora Core 5 performance-wise, so in that department it's solidly ahead. Slackware? Well, let's not compare it with Slackware. It wouldn't be fair to Ubuntu. Let's just say it's come a long way in the short time it's been alive. It's been nothing short of phenomenal. Seriously.