After running Mageia 1 in a virtual machine for a week with satisfactory results, I decided to upgrade my server from Mandriva 2010.2 powerpack to Mageia 1. I decided to do this the old fashioned way by burning a DVD and doing an upgrade using the DVD. (I figured I wanted to do several installs eventually, so one DVD download would save bandwidth in the long run...)
It did not go well. There were large numbers of package conflicts, and the installer error'd out after installing only a few of the almost 1800 it should have installed. This was just enough so that X would no longer run if I restarted my machine (different parts of X were no longer all the same version.)
I also discovered the "rescue" option on the install DVD doesn't work too well. I use software RAID and the rescue disk does not load the RAID kernel modules before trying to mount the file systems (when using the option to "mount the filesystems under /mnt". If you know the module names to "modprobe" at the command line it does work, but since install seems to handle RAID correctly this seems to be an oversight in the rescue function. (Rescue was not related to anything done wrongly by the installer, I just installed the boot loader on the wrong disk and had to go back to fix that).
The good news is that even from this conflicted state, the command line upgrade path using urpmi got me to a working system, even though "rpm -qa" still lists 30 or 40 Mandriva packages installed.
So my suggestion for other users migrating from Mandriva is to perform an inline upgrade, my experience is that it is more robust.
