The object-based audio on the HL 1 is awesome and unlike any headphone surround system I'd seen, completely convincing. (Usually I'm like "it sounds like I have a head cold, that must mean the sound is above me") I turned my back and moved around the room and always perceived the music as coming from a point where the web browser was hanging.
This isn't a great way to listen to music though because even a very modest stereo music system doesn't sound like it comes from a point but creates some feeling that it fills the space. It's great from the viewpoint of hearing an alert sound and knowing which window it came from (given that I can have a few windows open in different places of my house) but doesn't realize the reality that plain old stereo delivers.