Of course, the other advantage is mobility. Having a nice set of operational level games that I can jump into and play for a few minutes on my tablet while I'm waiting on a meeting or on a trip is great. I don't fly much anymore, but if I do, being able to just pull out my tablet rather than trying to fit a laptop into the non-existent space between my face and the seat in front of me would be wonderful. The other thing I enjoy is being able to flip back and forth between the game and reference material or a manual easily.
Given the quality of most Android and iPad games, I wasn't initially very optimistic about the future of our hobby on these new devices. These Tiller games, however, along with respectable efforts on the part of Battlefront with Combat Mission Touch, some offerings by Slitherine/Matrix, and new players like Shenandoah Studio are changing my mind.