I've been using four different drives, and I like all of them. Plextor PX716a (burning dvd's for customers (home movies), and for the ability to copy dvd's and cd's), Phillips (Benq1620) using stock firmware which I'm very happy with, but it won't make good copies if there are any weak sectors, Maddog (NEC3500) using maddog firmware for burning dvd's, and great for burning cd's, Pioneer A07XLA which I use for burning and copying. All four give great results, and each does somethings better than the others. For straight burning at high speed with low errors, I have to hand it to the benq 1620. But when I'm backing up my system, I rely on the plextor using TYG02 media.
The plextor is the only drive I have which currently allows CD and DVD testing with stock firmware.