I'm sure there is a considerable audio quality difference between my 1992 box and that which will be found on the BF set. No argument there, even if I won't be able to compare. The thing is, my box sounds just fine to me. It may be inferior sound-wise by comparison to a more modern mastering, but it's not like I've ever listened to the '92 box and thought to myself... "hmm... this sounds like it was no-noised". So, I'm perfectly happy, and I still wouldn't go out and buy a mammoth box with a high per-disc price (and a lot of what I would consider "throwaway" tracks) for the sake of better sound. But that's just me.
The other thing that kind of deters me with regard to that "Blowing The Fuse" series is that it may be too much of a "greatest hits" collection. I mean, I know it's great material, but a lot of it is so "classic", I can already hear in my head without listening again. What would appeal to me even more is if they had included more of the obscure recordings by the same artists. But that would be a bigger set... and really expensive.