Anyone commute from Southern NH/ME to BOS area

Hello,

I have been considering working in or around Boston or the North Shore. I am wondering if anyone has any insight regarding commuting from Southern NH or Maine to Boston area hospitals for work. I am curious:

How is your commute?
Do you drive, or do you take either the bus or train?
If bus or train, does the cost offset parking fees?
Is the generally higher pay worth the hour or more commute?
Any pro's or con's that you care to share?
Any problems with taxes (if live in NH)?

Thank you for any of your responses,

Tim