We've had a site-license for Sophos for years now. There are a couple of things about 7.1 to watch out for:

1) Minor thing -- when you "Scan My Mac" -- the log will report "corrupt files" for any *alias* on your hard disk. Sophos said this will eventually be fixed.

2) If you use Retrospect to back up client machines -- be aware that having Sophos 7's "on access scanner" active will add a *lot* more time to the "scanning" of your client computers prior to backup. In some cases -- on client machines with a lot of files -- it adds over an hour to the scan of the computer prior to backup. Backup speeds are about the same.

This has also been escalated to both EMC and Sophos (and the fault is Sophos, IMO as Sophos 4.9 did not have this issue...) with no resolution as yet.

I can't say that there would be the same issue with any other backup software out there, though...