A little research will answer your questions. The FSM has a good description of how the stock system works. You should be able to find out what the booster is doing from the manufacturer (website, manuals, &c) and/or reviews. Read through the topics on this site and others about remapping the ECM for better throttle response and using boosters.
I don't have any personal experience with either remapping or boosters but here's what I found on the Intertubes.
As far as I can tell, you can do everything with remapping that you can with the boosters. Ie, if you adjust the map via UpRev or other tuning software, the booster is not needed.
You could set things up so that the two complemented each other but that would just be making things needlessly more complicated since remapping alone will do the job.
YMMV
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