Pros
You can make good money, but you are going to be working a lot to get it. They hire just about anyone, and they don't waste much time when it comes to sending offer letters.
Cons
It's a 24/7 job. The management of Sperry, the side that does mud logging and mwd is very unorganized. You will be called out at the last minute a lot, only to make it to the rig and find out that the managers knew days ago but forgot or waited to tell you. They will tell you there isn't any work, 2 hrs later they will tell you they need you at a rig tomorrow, and 2 hrs after that they will tell you nevermind. I think they do it on purpose to the new people just to see how much they can get away with. Not a lot of opportunities to move out of the field and into a more technical role. No work/life balance, especially in the first year. The promotion system makes it very arduous to move up. It's good if you want to make some good money for a few years after school, but after that you may want to move on. After a few years the salary doesn't match the amount of work you perform. They lose about 25% of the field hands per year, either because they are overworked, don't like the job, or don't see where they can move up. From what I've seen Schlumberger (geoservices) pays more, has better technology, better training, and more capable personnel.