we have the 1Tb version and its over 50% full. there is a way to get the stuff off that you can archive for ever at home but i am not that bothered. the best bit about renting them is that if they play up you get a new one, no aggravation.
You can get stuff off, but it's a pain as it is with many Sky/Virgin PVRs. Some freeview PVRs it's a not too bad getting off.
Didn't really mean the archiving as such. Just meant people tend to record loads of stuff and leave it for ages or may want to watch it more than a day/couple of days later. 1Gb is absolutely fine, but the original two generation PVRs are now very dated, especially the SA. Well the SA is quite literally dated as due to the constraints of the hardware I've had 21hrs of the guide chopped off and there are big problems if any new channels launch as the EPG is near capacity.
Disagree about the renting being an advantage. PVR outright failure is generally more rare than people think (well more specifically with virgin). You normally get other problems instead and then find that Sky and Virgin Media can get very, very arsy indeed about replacing it. On the other hand there are complete tossers out there who complain about the slightest glitch and demand a new box, so I have some sympathy with them. There are other customers who seem to get boxes replaced at the drop of a hat when it is actually a serious problem.
Philosophically there's no particular reason why you should 'own' a virgin PVR or STB though. Virgin is a closed network. It's just it got very irritating on the SA V+ where sky customers were putting in beefier and beefier hard drives and one was stuck with a prehistoric 160Gb

.
I would say the biggest 'confidence' in tivo is the subs figures. HD take up for virgin was traditionally much poorer than Sky this was because of many reasons - poor channel line up, not advertising it much, the SA V+ being the only show in town and dated unfortunately (compared to later sky boxes) and so on. I think Tivo is now 25% of tv customers which really shows how good it is and how much better than the previous ones it was.
And a few other things to come. I'm hoping the rumour mill stories about ITV 2/3/4 HD (which I find deeply implausible) are true (for the cycling). We'll have to see what TV Anywhere is like.
Biggest problem with Tivo is imho the lack of apps. But then there are reasons why they aren't too keen on that. And apps on some smart tvs and other smart devices are full of complete rubbish.