Well I write on TDk , Sony, Memorex...and other but I'm sure speed isn't a problem because i know how 2 use it and for example when the cd's max speed is 48x I write at 32x-40x so ...
I used 2 write on noname CD-s, u know on those who are "made in china" or made by " phantom companies' but now I write only on good ones like Sony, TDK,....