@hongcho0:Probably depends on the person but I've never had any problem using my surface rt in my lap. The touch keyboard is plenty rigid. I think it's a question of angle and if your legs are long enough to support the keyboard and the stand. I'm not tall (5'10") so I think it works well for most people.
And resolution seems a bit like thinness in that there's a point beyond which the gain is negligible and it just becomes a marketing number.