Not exactly firestudio vs. traveler...but, I have both a firebox and an 828 mk2, and IMHO they are very similar, except when using the firebox in bus-powered mode (ie without the ac adapter) -- which adds a very unpleasant whine to the noisefloor in my studio. If anything I'd say the 828 is just a little more detailed. But all in all I'd say they're pretty interchangeable...and the firebox is a lot more portable, and about half the money. The 828 has more easily configurable hardware ins and outs, which can be nice.
Myself, I'm looking to upgrade soon, probably to apogee symphony....partially because of the sound quality and partially because I'm getting the random interface crap-outs I'm getting. I don't know if anyone else is having firewire audio issues, but both of these interfaces are crapping out, randomly, unexpectedly and it's a real PIA. I've read a bit on-line which suggests that a wide range of interfaces have had problems in os 10.4.xx.
I keep updating drivers, new operating systems, etc, hoping that it will be fixed, but it never is......Fortunately, it's also not a completely debilitating problem, usually a reboot solves things. But it is a buzz kill.
Maybe it'll be fixed when leopard and the new logic 8 with the new psychic mind controller come out.....but, then again maybe not. (in a way, I hope not, that way I HAVE to throw down the 4 g's on an apogee setup....http://www.gearslutz.com/board/images/smilies/thumb.gif
Maybe that should have been a new thread....right now I'm kind of down on all firewire interfaces.....