Blu-ray
Just watched the BFI-released Blu-ray, all five and half hours of it. It's been restored very well and looks excellent on my TV. Not as good as seeing it in a large auditorium with a live orchestra, which is how I've seen it in the past. (Went to one of the first London screenings back in 1981 and seen it many times in London since.)
The only downside is that for the triptych sequence, you ideally need a very big TV, bigger than I could comfortably get in my house. I ended up watching it from about a metre away from the screen, wearing my reading glasses.