Picked-up a 40B couple of weeks ago... about 300-rnds thru... great shoot... flawless, CZ quality all over, big-gun feel with a soft recoil!! As all the guys have mentioned, it's simply a great deal NIB for $289 from CDNN... comes with ONE mag, so add another $20 for a second, and you're set!
Angus's got a pretty good handle on the 40's history (read his opening post)... it was started from 'scratch' with Colt, so the .40 cal was NOT an after-thought.
Regarding size, I have a 75B and a SP-01... laying 'em down alongside the 40B... both are about 1/2" longer (barrel length)... weight of the 40B is slightly lighter that the 75B and alot lighter than the SP-01.
For about $300 it's a 'no-brainer'... go for it!!