works mostly,
That's quite a deal you got on Ebay! I would not have thought it possible. Tivo was selling the Premier for $300 a year ago. I got $100 off, because I already owned one Tivo, but the whole thing still wound up costing me about $500 with lifetime service.
I just looked at the Tivo website and they are now selling the Premier for $99, which is a great price.
So, for $400 the OP could have a Tivo with lifetime service, which could start to compare favorably with other options for his use. Remaining things to watch out for would be:
A - I've heard the newer ones require a subscription to work even as a dumb recorder. Not sure about that.
B - The Premier requires an ethernet connection which it uses to get the schedules, software updates, etc.