I went on a business trip last week. I was forced to take my work laptop, but I used it only when absolutely necessary. I wanted to use my N810 as much as possible. Here are the pros and cons.

PROS
1. I liked being able to pull it out at restaurants and airports to see if wifi was available. I could quickly and easily check email, even while walking through an airport. (For the record Amy's Ice Cream at AUS offers free wifi, otherwise it's all paid; SJC appears to be all paid; it's free throughout PHX.)
2. It's small and lasted much longer than my laptop between charges.
3. Much easier to use and then stow for take-off and landing than a laptop.

CONS
1. The GPS is useless! I was traveling with someone else. He had a GPS on his phone. By the time my N810 locked in we were already at our destination courtesy of his phone. I at times saw 8 to 10 satellites, but none of them green.
2. No wifi at my hotel meant I couldn't use my N810 there.