This is my first time using Mandrake, and my first impression is very nice windows manager & well balance distro.
It seemed to be a bit quicker than Yoper in KDE 3.1.
The intall is painless nicer than RH8.0 or Yoper (but auto detech is slightly weaker than RH8.0). It give the user a bit more control & information over the system during install then the previous 2 mentioned distro. Mandrake 9.1 give the user the option to chose which type of services that user want to install. But, it doesn't tell the user which packages that come along with the chosen option (would be nice if it add an informative screen like Debian during the picking process). The package install view can only be seen during the actual extract/install time when click on advance view, which in my book is too late.
However, it have the most advance configuration screen one could ask for (networking with Windows Domain, Remote Desktop, NFS, etc...) prior to first boot.
Another bonus is that the 3 disks ISO come pack with usefull apps, and the menu bar have the cleanest & most organize that I have seen on a Linux distro.
IMHO, Mandrake 9.1 is the desktop rival to Windows, and is capable of replacing Windows XP.