I had similar experiences to Moth3r with aweful Princo discs. The first few that I tried which were from a mates spindle and were good. The two spindles that I bought however were completely different and were all rubbish. In all that was 3 different discs under the same brand/logo! Verbatim does this as well so I guess Forrest Gump was right 'you never know what you're gonna get' even with the big brands.
umm, and I hate to say this Moth3r, but I think there are also 'fake' discs that report a different manufacturer for their disc ID. There are aparently fake Taiyo Yuden and other media, so I guess it pays to watch out for discs that fell off the back of a truck or deals that seem 'too good to be true' etc.