Wow, that Zoom B3 looks interesting.  I've got two Lexicon MPXG2's; one for guitar, the other for bass.  They're so cheap now, its ridiculous...something like a couple of hundred quid now, including the footswitch...and they're swiss army knives.  I've also got a Native Instruments Guitar Kontrol set up too via my laptop. 
 
But the thing that has kind of bugged me is the size.  Its not exactly a two handed, single load out solution.  Much better to have something like the B3 which can be chucked into a gig bag for most covers/function band gigs.