Or maybe not...
I have a Lacie External Firewire 8x DVD burner that has always worked just fine. When I bought it I bought a whole load of TDK 8x DVD-R's and CD-R's at Costco and I've only now depleted them. So I just bought two spindles of 50 DVD-R's -- one 16x Memorex and one 16x Maxell. And guess what, neither one of them would work at all! I kept getting "Communication Error" messages, from Toast 7, Toast 6, and even Apple's Disk Utility. Lacie suggested I update my burner's firmware, which I did, and now the Memorex will burn okay -- but still not the Maxell. So I'm returning the Maxell spindle.
Interestingly, Lacie only "officially" supports three brands -- TDK, Sony, and Verbatim. They could not guarantee any others would work.