I got a netbook for traveling before the iPad came out. It now boots up slowly, but if you don't put too much stuff on it, if you are only using it for taking notes and going online, it is convenient because it is small and inexpensive.
One thing is that some of the keyboards are much smaller, so you have to get used to typing in a cramped way....
When I travel I prefer the lightest, smallest computer that I can carry around with me anywhere, so the netbook worked for me. But it is definitely not fancy and you can't run too many programs on it without it slowing down.
(I don't have an iPad so I cannot comment on that.)