I got a reply to pre-sales enquirey from mark on 29th that:
"You may have to add cache exclusions for Wordfence Falcon to be compatible with Woo. "
However there is another reply to a question on woo commerce compatibility here: http://wordpress.org/support/topic/woocommerce-21x-compatibility?replies=2
where mark says it is compatible.... :S
Very confused, holding off on installing/buying premium lic till I can get some clarity here.