Great news! I am looking forward to getting mine in. Did you change from a Voodoo to the Radeon 9250? This is what I will be doing. Did you have to use a native Amiga screen and start all new screens on the 9250 or were you able to reuse any from the Voodoo?
I am just wondering what process I will need to do once I install the new card.
I changed from Virge (my description in signature below is wrong (old days), and I don't know how to change it!). You need to change your Virge monitor file (Devs/Monitors/) to Radeon (also in tooltypes from Virge to Radeon). Also don't forget to copy (by hand) Radeon.card to Libs/Picasso96. It is NOT installed (?!) automatically using Mediator installer. Then I run MediatorConfig and there were few specific "options" like do you use Radeon 256 or 128, MMU etc. after that it worked find and pciinfo detected Radeon properly on 1 PCI slot.
Now, I need to set up screen modes to use something more then 800x600, but I think I need to do manually, since none created automatically seem to work properly.
I'm setting up system from scratch and Virge card did not need that much attention. It simply worked.
PS. Only problem is that when I tried to run P96Speed Radeon seems to be slower then my VirgeDX (in many "tests", but it some other much faster). I don't see any difference in Workbench speed, but I REALLY like DVI output

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Good luck with setting up your Radeon!