If you're a "put down roots" type of person, this might not be the best option, but there are new methods in place so that employees might be able to move less (?). Certain community service opportunities (Big Brothers/Big Sisters, mentor-ship programs, etc. ) and pursuing adoption/foster parenting may not be feasible due to uncertainty in your life.
When a new project is ready to be implemented there is a TON of overtime to meet deadlines, even for training coordinators.
You spend the first month in the dark a lot, because you don't get your company training for about 3 to 6 weeks after your start date. If you're lucky enough to hire into a busy project, this might not be a big deal since you'll be too busy to worry about company history and standard procedures.