Welcome to the group. First off you should know this is a high-end group of people on this forum --- so you'll hear a lot of good and bad (a lot more bad it seems).
Just for the record, I bought 2 of the refurbished units - one was a 5040 (now a 5160) and the other is a 5060 (soon to be 5080). I connect via ethernet and have had zero problems with my two units.
You might get another impression by reading the forum, but remember these are mostly high-end users and of course the squeaky wheel makes the most noise - or something like that.
Again, welcome to the PVR world - it will definitely change your life (at least the way you watch TV). If you are a football fan, my first suggestion is to schedule a recording of the game you want to see this Sunday (add an extra hour via the advance settings) ---- then at 2:30 or 3pm (for a 1pm game) start watching the game. You'll be amazed how you have total control --- and watch the game in 1/2 of the time (or less). Football season is one of the best demonstrations of the PVR.
Good luck!