My Dad worked away a lot when I was growing up. I promised myself I'd never do that to my children.
I think you need to tie down some of the floaters. When he says from a few days to a few weeks - how long does a few weeks mean. Are we talking 2, 6, 10? How long is a few months? 3-6 away from the famly? How often are you expected to be travelling. Its not just the time doing the job while you're there but factoring in the travel and inevitable delays on top.
On the other side of the coin you have the peace of mind of things like pension, life assurance and can make a good nest egg to provide for the family. I guess it depends on whether you can stand being apart for so long and whether the remuneration package is really enough to compensate