i was expecting nothing myself..
my expectations were:
1, probably can't share desktop...
2, probably get 50 error messages on start up, not finding DLL this and that.
1, No problems whatsoever.
2, desktop shared, Nvidia do their thing, AMD does theirs, shaking hands and shxt.
at this point, if you have a card sitting around..
I think it is worth it to have both drivers in! my SCII experience actually saw improvements!