The server software from Apple certainly has improved over the last couple of iterations. Snow Leopard server is by far the complete offering they have produced. These tools are exemplary of that quality. I've often been on the road or at home, and been required to administer a user change, add calendar resources or update software; this package has allowed be to do this without any problems.
I still have issues at times w/ firewall access, but often feel that is due to the missteps of our corporate's IT setup. Often, once I have them "open" the channel for my access, there's no problem....until they tweak their settings again!
Kudos to Apple for making their server offering easy enough for novice like myself, and even more so for these tools.