I completed the basic course through the Tacoma branch this past year and am found the experience to be some odd mix of Army basic training and a full semester of college.
This is not to say that these are bad things, just that the course requires a lot of time, commitment, and discipline.
An important component is, as Cale stated above, keep an open mind.
There are many excellent instructors in the Mountaineers (as well as the standard level of douchebags) and I rarely found the level of dogma for which the Mounties are reputed, not saying it isn't there, just not as bad.
Anyhoo, just my .02