I don't no much about them yet, but from what I have read so far, the Pioneer A03 is better than the rest. I really don't care for HP, except thier printers. Others don't seem to do DVD-R, only DVD-RAM.
A guy at work who manages the TV station in my building (local goverment television) just bought one. He does video editing and stuff obviously. He is going to burn DVD's instead of recording VHS tapes for people who need the board chamber proceedings.