From: United Kingdom
Yes, Prodisc have two "house brands" -- Smart Buy and Eproformance.
As Rex says, Prodisc 40x compatible media should go to 48x without problems on most writers. TBH I've managed to get 52x on an Artec writer out of the 16x Prodisc media!!! The C1 error count there was not brilliant (max 63, average 12) but those figures are tolerable.
I have an MSI here. I've been able to burn TY (40x-rated), Ritek (48x), MBI (48x), Postech (48x) and Acer (16x!!!) media at 48x. The write quality is generally quite good as well.
One thing you have to bear in mind though, is that the 48x MSI (and Optowrite and Accesstek which are the same drives) are "dumped" product. They're essentially 40x drives that have been modified in firmware to 48x (hence the reason they use ZCLV instead of CAV), "overclocked" if you like. Hence they are picky, exactly the same as the Artec 48x in fact (which was trashed over at CDRLabs, and rightly so, although the new firmware, which also works on Artec/Aopen 32x and 40x writers, doesn't seem that bad actually). Not much can be done about that really except to avoid these brands at 48x(the 52x writers by both Artec and MSI though are much better, being designed for the purpose). They are cheap because of this fact.