I regularly deal with Mac Graphic Studios/Corporate Communications Departments that are an island of Mac users in a sea of PC's, generally sharing Server2000/2003 resources and for this type of client, that can't justify the expense of an XServe for 3-15 mac users, this product is great. I sometimes refer to ExtremeZ-IP as the poor man's XServe but that really doesn't do it justice. If you are in an environment that requires your Mac users to share space on a Win2000/2003 server this product is light years ahead of the SFM protocol in both speed and compatibility and their support department really stays on top of issues.