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This is an excellent tool for communicating while diving. I purchased it to use while diving at the local Aquarium. It allows me to write notes to the visitors outside of the tanks, especially the kids. I also got it to use with students taking the Advanced Class to demonstrate the affect of nitrogen narcosis on the deep dive (put simple math problems on it and let them try and solve them at depth). The only complaint with it is that it is very large and hard to stow while diving.
I like it because it has a catch to allow it to be rolled up until needed - not draging behind. Also the plastic handle and locking device allows it to work with one hand (the other holding an irate lobster - and coming from New England, ours fight back!).