Played a sng on the i pad, it works very well, need to be a bit careful with the slider, although the option is there to type bet in.
Will have its uses ie if in a tournament and need to make dinner/tea can take i pad to kitchen, i use a desktop pc so wasnt practical lumbering that from room to room.
Still doesnt help when you push with AQ and big blind has AK, but thats a different story.
I dont think it will play to well on the phone, bit too small, but on the i pad well impressed.