To update the above, I don't like monopolies,
ESPECIALLY when they own almost all the patents to a specific device, in this case DVR's. Which is why there aren't any other true one piece (all in one)TV DVR's available
new anymore. Note I stated "all in one". All the others , you need one or more 'other' hardware pieces to make them work. Namely, a separate HDD and depending on which one you are looking at a Computer.
Their series 6 Roamio model 846500 or 846510 (depending on the size of the HDD) can be had for as low as $250 on eBay
IF you are lucky. At that price, it won't be there long. I saw one get sold in less than one hour around 5am if you can believe that. A more common price is between $300 and $350 (w/ Lifetime Service of course).
90% or more of the units for sale do
NOT have Lifetime Service which runs separately around $500. Or you can buy it monthly which all of those had before the owner put them up for sale. (not sure what the monthly cost is).
Anyway. below are screen shots of the Guide (that goes out 2 weeks) and the important System Information screen showing the Service level (note the yellow arrows). Look for that shot in their ad, if he didn't include it, ask for him to post the Menu shot. I always ask if he is the original owner and if he has the original box and how long has he had it. Confirm the size of the HDD, many have put larger drives in the DVR (2 or 3TB with some).
Oh, the number of channels( the main channel and the sub-channels) available in my market is around
80 (eighty). No, I'm NOT exaggerating, depending on where you are, and mostly where your antenna is (outdoor of course)