I know this has been said before, but I'm hardheaded and needed to learn for myself.
I have a bunch of Grateful Dead shows to burn (all the ones I went to back in the late 80s/early 90s). Following my old beliefs, that "CDRs are CDRs", I bought the cheapest inkjet-printable I could find: Dysan-branded Prodisc.
I burned a few at 40x in my Pioneer 110D. Played fine in the car, but through headphones I could hear glitches. Figured they were in the source tapes.
Burned a few more in my old TDK 121032 (12x max speed). These were much better initially.
Today I had a chance to compare a 48x Fuji MIJ (Taiyo Yuden) burned at 52x in a Plextor Premium to one of the Prodiscs also burned in the Premium. The Prodisc had 250,000 C2 errors. The TY at 52x even beat the Prodisc burned at 16x. Then I went back and scanned some of the first Prodiscs I burned (at the very end of 2005)... pretty poor quality as well (worse than I recalled, but I used a Lite-On DVD burner to scan).
I'm tempted to dump all of this Prodisc media in the trash.
Oh yeah, here's the scan of the Prodisc at 52x.