I can't help much I'm afraid. I bought them as individual seasons, and mine are PAL/Region 2 formatted, so they may differ from those available in the US.
None of the listings or reviews that I've seen for the sets you asked about mention being remastered, only repackaged. The descriptions do seem to vary in the number of discs they claim to contain - 33, 40 and 52 discs can all be found. My sets came with a couple of seasons on double sided discs, so that might explain the different numbers. While not ideal, I'd rather have double sided discs than reduced quality due to more episodes being squeezed onto each disc. There should be no more than three episodes per disc (side) plus the occasional DVD extra.
The picture quality on my set is what I expected. It looks fine on TV, but you can see slightly ragged edges when viewed on my laptop.