Don't get me wrong, the DHD4000 is a fine DVR, but it seems to have incredible resale value. I've been keeping an eye on eBay recently, and I saw one go for £155, with the average price being over £125. And some of these second-hand Thomsons were out of warranty, without their original boxes etc.
You can get a brand new Fusion 100 for less than that! Not quite as good as a DHD4000, IMO, but not far off, and you can get more recent models for not that much more. All seems very strange to me.