Two excellent references - thank you both. (I was looking through Pioneer's site earlier today, but couldn't track down this page.)
From the DVDRHelp reports, it looks like Datawrite/Datasafe would be a far better alternative. I'm glad I held off of the purchase. Edit: and of course, now I see that the above brands seem to only be available in the UK. Argh! I'm woefully close to tossing my burner into the backyard and going back to 5.25" floppies ...