Career path: on paper, there is a defined path for you to follow. Training: with out a doubt training is the best.
Cons
Management not always honor what they promised. Hard to deal team: they all think they are right and they will throw you under the bus if they need to.
There are a lot of opportunities for travel if you like travelling. The bonus package is nice and if you are an American citizen you can actually get a given multiple (i forget what the formal name is) times your base salary.
Cons
You are basically married to the job and you stay at the field site for extended periods of time. You should also throw the notion of a 9 to 5 out the window. You can be called in at 2 am to make a 4hr drive.