For me, it was lens or iPad (I already have a 16G wifi+3G iPad), and I decided to buy the last gen 64G wifi model for my upcoming trip to Spain and Morocco. Yes, I'll have two iPads along, but as I'm not taking a laptop, it'll mostly be used for photo storage enroute. Plus that way himself can use one of them, too, and that means he won't need to bring a laptop either.
Since a bunch of early adopters will be dumping theirs on the bay, I should be able to pick one up cheaper than the refurbs on the Apple store.
I've been on six trips since I got my first iPad (I'm on my second; the first was wifi-only, and I upgraded later in the year). Except when I was on call and would need my laptop, I've been able to do just fine with only my iPad. As someone who normally has a laptop as a part of my body, that was surprising to me.