Well, for me, it is nice to not have to use a mouse clicking on things and battling sound card issues, great conversion (noticably beter than my soundcard), portable if need be, and very simple to operate. I am much more effecient as far as recording goes now. It does have downsides, but I am much happier recording with this than I was with Cubase and the like. Plus, you dont have to deal with computer issues and noise (post fan mod on the HD24). And as far as editing, I find the punch in and out better and quicker than what I was able to do with Cubase.
If need be, you can then send those tracks to the computer (Firewire, Ethernet, etc.) and edit from there. My only complaint is not being able to use VST with it on the fly. Thats the only area where I preferred the computer. All in all, minus the technical problems, I am very happy I got it.