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.

reality:

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!