SP2/SP3 Upgrade with ACRAID driver (Adaptec 5805)

Has anyone done a upgrade to the latest service packs using this adapter?

I am wondering if a down-server upgrade is the best approach (but it
seems you must load the drivers).

Is it best to use the "rug" approach?

Do you need to re-install the ACRAID driver afterwards and run mkinitrd?
(I have downloaded the latest drivers -- April 23/2010 from Adpatec. I
have not installed the on the SP1/Sp2 version of OES2)

Has anyone tried this or similar and got any quick hints to provide?

I hope to do this upgrade Saturday/Sunday so any thoughts would be welcome.

Thanks in advance if you can help.