To me this is a huge competitive advantage over other services. I'm too much of a tinkerer/control-freak to pay for a DVR, especially when I can use an open-source one for the channels I get.
Sounds like a beast!
Man... I have an HDHomeRun now and like the way it works, so I was looking at the HDHR Prime, but now the Ceton card is the same price with an extra tuner. I've got the slot, but right not it's not supported as well in MythTV. Tough decision.
Me, too (well, S3/sleep because my motherboard won't RTC wake when off). My remote frontend uses wake-on-lan to bring the master up. The only thing that would be an issue with powering-off is if I wanted MythWeb available all the time, but so far I've not enabled it outside my network just so I don't have to deal with security. That and I haven't screwed with the remote waking it up so I have to walk 5 feet and push the button if it's not on, but I'd feel pretty lazy if I left it on all the time just for that.