My nephew has B4, it's really nice. I use OrganizedTRIO, and it also has a pretty nice tone to it. Neither of them are spot on recreations of the original, but come very close. Both are better than hauling an original around.
I use my FCB mainly for it's 2 Controller pedals, but my live rig consists of a PC running soft synths with M-Audio controllers, which have poor porgram change functioning for live use (You have to hit a button then enter the program # via the keys then enter via the keys and then hit the same button to get back into performance mode). This is time consuming at best. So I have my FCB buttons transmit Program changes (2 buttons for bank change, and ten for programs). This works out great as I can be playing hardware synths, and soft-synths, and change all my software programs without ever taking my hands of the keys. Basically I set up 3 Softsynths per program (1 for each controller keyboard), and can change them all with the tap of the foot while playing aggressively with both hands. You can set up the buttons on the FCB to do many other functions, including MIDI CC data (as the pedals do), even use them to as regular footswitches for external preamps etc. via 1/4" jacks.
Definitely the FCB was worth its weight in gold for me (Got it used for $100), and is one of the few pieces of Behringer gear that I actually use. I also use Behringer Stereo Volume pedals (1 for each hardware synth, and 1 for my computer, and they are built like tanks), that way I free my MIDI and CV pedals (they can do CV too) for other data (i.e. effect control).
Note: if your not familiar CV pedal=1/4"-jack pedal used to control keyboard.