There's really no "premium" or "value" specification for Taiyo Yuden.
You've got normal TY media, which is what some resellers call "premium" in order to distinguish between the two grades and assure the customer that they're getting the approved product. On the JVC website, that's all they show - normal ("premium") Taiyo Yuden media that passes their quality standards.
Value-Line media are the rejects. They aren't sold to OEM customers (i.e. Verbatim, Fujifilm, etc.), nor will you find them with prominent JVC or Taiyo Yuden branding. In terms of packaging, it's tape wrapped media with a big "Value DVD-R" sticker around it. Some distributors used to list it as "Tru Blu DVD-R" to avoid any confusion.
For everyday use, I don't think Value-Line is actually bad media (although I agree that it isn't worth the money when normal TY media costs almost the same) if you scan/TRT your burns and throw out the defective ones, but I digress.