I am a personal trainer who currently uses a clipboard a paper to track clients. This is not efficient or organized for me. Would you say the nexus would be good to track clients while working with them? Looking at purchasing this or the iPad mini. I would want something that is quick to jot down, but able to go back in the past and easily look at progress. Looked at some excel type apps but they look like they would be too complicated and i would be messing with it too much while training to type in a number. Thanks