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.