Not all cheapies are bad
Ritek has been getting a lot of decent reviews, and I know of a professional media outlet here in Denver that has started stocking these disks ( The Tapeplace ). Some of their pluses are that they build a solid disk ( doesn't come apart ) and the dye they uses is a deep solid purple, that doesn't appear to to have been applied stingily ( a traite common with cheap disks ).
I have tried these in several burners, including my original A03 superdrive and have had excellent luck with them. In fact, the A03 hated all but SONY, VERBATUM, Pioneer, and Apple disks, but these also work well. I have also tried them in several DVD Players, and always had good luck with them. Best part is that the 4x version of this disk can be found for under $2 at meritline.com. I believe that these are the disks that Meritline itself uses for housebrand.
As far as other cheap brands.... they generally suck. If they burn ok, they probably will have playback problems in some DVD players, and over time, the data may fade away.
Just my 2 cents worth of 2+ years experience on DVD-rs.
Max