I did the same job for over 4 years and my boss changed 3 times. First 2 were great and the last was a "Dud".
Not all, but some managers could care less about an employee's work/life balance and the unique values an employee can provide the company.
Travel can be extreme. Doing the same job, I went from 10% for the first 18 months to 100% when I left.
Employees are expected to the bank. Itron's travel policy (when I worked there) required the employee pay for all the travel expenses from personal funds and then submit expense accounts for reimbursement. If I missed an expense, it was out of my pocket. My expenses exceeded $50k/ yr.
Incentives/bonuses for project mangers became more complex and virtually unobtainable. I quite trying.
I was laid off (by the Dud boss) because I would not accept a project that required travel 100%, 2 time zones away for almost a year. My boss did absolutely nothing to help me find a job within company as well. I felt as if I was "just sucked in" and later "spit out." Itron did provide a minimal severance package only after some negotiation.
There is a high turnover rate of project managers and sale executives.