(Android is another story. Android devices are still very useful, but the difference in quality of experience between an Android device and an iPhone is like night and day.)

There is quite a bit of variance in quality among Android devices. Personally, I would take a Samsung Galaxy Nexus over an Apple iPhone.

I was pretty late on the smartphone bandwagon. The only reason I got it was to be able to use Anki on the go. Now I use about a dozen apps and get an enormous amount of value out of it.