It uses the PC maps, as the "two brothers" worked for dynojet, then fell out with them, opening their own company. The juicebox pro is just a pc3 with a storage capacity for 9 maps so you can chop/change on the fly.
As for maps, I downloaded the map pack from the fz1oa site, and matched a few maps up to my mods, then went out and played! There are some good ones, and not so good. Its a lot easier than using one map at a time imho, and if your not into home tweaking (99% don't adjust their own maps) then its the better bit of kit for the job.
What mods are you running/planning?