Someone in an earlier review rated the DSP-400 headset as useless for voice recognition.  Not sure what his technical problem might be, but Dragon rates it as "6 dragons" on its hardware compatability list which is the max, and I have bought two of them...at different times...one for work and one for home since I was so pleased with performance using two completely different types of PC's, memory size, etc. It works great for me at least.  I am a long time Dragon user, and this is the best headset I have tried.  So beware the "worthless" review.  Picking the right headset that works with your particular system can be iffy...but I have two of these headsets and I couldn't be happier with the recognition voice quality. (I use Dragon Preferred Version 9 at the moment, so I can't say whether a different version would affect performance.)
Someone in an earlier review rated the DSP-400 headset as useless for voice recognition. Not sure what his technical problem might be, but Dragon rates it as "6 dragons" on its hardware compatability list which is the max, and I have bought two of them... at different times... one for work and one for home since I was so pleased with performance using two completely different types of PC's, memory size, etc. It works great for me at least. I am a long time Dragon user, and this is the best headset I have tried. So beware the "worthless" review. Picking the right headset that works with your particular system can be iffy... but I have two of these headsets and I couldn't be happier with the recognition voice quality. (I use Dragon Preferred Version 9 at the moment, so I can't say whether a different version would affect performance. )