NAP and Sophos AV?

Does anyone have any experience with NAP and Sophos that they would like to share? We use Sophos 7.5.1 on our network, and we're thinking about deploying 802.1X and NAP (with dynamic VLAN distribution). In my lab test Sophos is not being recognized as a valid AV client by NAP, therefore I'm not "fully compliant", but maybe it's just an error somewhere in my configuration?

Also, we have a few MACs on our network (sigh). How do you guys deal with MACs in your NAP environment? Manual static VLANS? 

Thanks!

Dan