Depends on who you talk to. Not everyone brain dumps everything or felt like TBS was a waste of time.
And its Corps, with an "S." The Corp is where you grab that coveted cubicle job once you leave the military.
The only guys who braindumped everything after TBS were the FIGMACs. Unfortunately, not having really taken part in any ground and pound training the last several years has left me pretty rusty. In addition, lots of the stuff learned at TBS is out of date since tactics are always changing. Friends of mine who have been through IOC told me that the things they learned there were much more high speed.