My T4 is now 9 months old. I record at least 2, usually more, shows per day and have occasionally recorded 5 shows at once.
2TB WD RED came installed (only ever about 30% used).
Zero problems (fingers crossed).
Amazes me how it networks (after a bit of a learning curve) with my NAS and other devices. Much more functional than my Topfield 7100 which died after 7 years. Same picture quality (as far as I can see) but way more functionality than the Panasonic Bluray/PVR (which is admittedly easier to use but does not have programmable remote buttons for time skips which I can't live without as I refuse to watch any ads).