Many, many people use the Value Line product without complaint, and as I said TY "rejects" are better than other mfrs "primo" media. Now and then vendors do offer ridiculously cheap deals on the Value Line, in which case they can be a good choice for lower-priority burns or giveaways. But the fact remains they are "seconds", and since the entire point of bothering with TY at all is for its superior quality, why trifle with seconds? For important or archival burns, I'll always take the additional insurance of the "premium" media.
The quality difference between "value line" and "premium" is minimal: like DigaDo said, TY is not in the business of making crap- they aim to be perfect, every time. The "rejects" fail TYs very tough internal standards but would probably pass at CMC or Ritek without a second glance. The people most likely to run into trouble with the "value line" are those like myself with older recorders that now need 8x media to burn successfully: there have been many reports of 16x TY being mixed in with the 8x TY "value line" packages. If you absolutely must have 8x, and find out too late that you got 16x, you're screwed because you won't be able to burn it. So I guess the best advice is, if your recorder is new or you're using a PC, and the "value line" price is WAY cheaper than the premium, it can be a good deal. Otherwise, stick to the premium.