Every time I play with a SP3 at a store I want to take it home with me. However an important use case for me would be to take it out and do some typing on it on the bus or subway once in a while. It seems like a Yoga would be better for that. So does anyone here actually really use it on a bus or sitting on a train, is it really stable and usable in your lap in such conditions? I see plenty of people using laptops and have no doubt the heavier base makes them relatively stable, but does the kickstand really do the trick? Thanks!