Those d8b's are cheap. You can find one used for like 2000-3500 now. Is he satisfied with the sound of the roland hard disk recorder? My first hard disk recorder was the vs 880ex, and I loved the machine. Yeah, the track count sucked, and the pre amps were not the best, but the machine did have its own sound. I miss that machine.
Is he going to dump the roland machine?
Personally, if I were not tracking and mixing large sessions, at high sample rates or in 5.1 I wouldn't get it. I would purchase a 002 or 002r, have mods made to the unit, purchase a great converter (Lynx or apogee) and snatch a couple of more pre amps. I would run the new PT with the 48 stereo tracks, and I would purchase a summing box for an "analog" type of mixdown.
If I were your friend, thats what I would do.