Free printserver is way cool too.
Haven't tried it yet, but a printserver by itself is not cheap. Just makes the SMC a better deal though IMO.
I had trouble setting mine up, because of stupid arse @home, and the SMC guy was so friggin cool about helping me at 3am no less. We actually BS'ed for like 10-15 minutes after he set it all up for me, and he couldn't believe the @home guy gave me all my network settings. They do frown upon these after all.
Not sure about what the others offer, but 24/7 tech support rules.