Thanks so much for the responses! I find that my finger often works fine with Room Planner but there are times that I need to see the numbers under my finger as I pull a wall, widen a sofa, etc. Using the pencil would resolve that issue, but the certified Apple dealer doesn't know a lot about how the pencil works! Guess I'd better make this purchase at the Apple store!
Another question - how will I transfer Room Planner to the new iPad? I don't want to lose anything. Thanks in advance for your input.