I have decided to get the boxset, because I'm so afraid of something going wrong with my copies, it's probably a good idea to have one spare. I thought my vol. 3 DVD was conked the other day: in the final "chapter" of one episode, it started stuttering, and paused of its own accord, with the screen gone all chequered. I cleaned it with the appropriate stuff bought from HMV, and at first I thought that had made it even worse, because it was refusing to load at all! However, I gave it another wipe, and (touch wood) it then recovered. It has still prompted me to get a complete "spare" set, though, and the extras DVD will be a bonus.I certainly don't seem to have a Midas touch when it comes to technology. CDs can also become dodgy on certain tracks, for no apparent reason.