I figure with as many different retail lines that HP has, something has to fall through the cracks. Also they have many different companies making their drives for them, then slapping the HP name on it. I know Iomega must do this to an extent, but their main focus is removable drives so that is why I bought the Zip CD. I have always been able to get regular driver updates from Iomega.com, and their site is easy to navigate. I lost MusicMatch Jukebox CD-R capability when I switched to WIN2K, but updated to EX-CD Creator 4.X and it works even better than MM. Rips my MP3's back to CDDA .WAV files on the fly with ease thanks to the 2mb buffer.
I would not buy a HP USB drive, but I have have used the Internal versions of HP's drives before and had great luck. I think Iomega just does USB better since they are a cross-platform company (If you own a Mac you probably have a Zip drive) and HP's main focus is on PC's.
My 0.02