Extremely effective
This is a very polished and very effective tool by which to learn and practice CW. If you’re studying via Koch or similar technique where you learn a few characters at a time, it’s easy to turn those on as you learn and be drilled on both receive and send, and it’ll automatically focus on the ones that are problems for you. Most importantly, the author has provided an open source and open hardware solution that’s simple to build and in my experience bulletproof in use. This combination of both receive and send training, using the computer you’re already sitting at, makes for no excuses in slipping in a few minutes here and there, greatly accelerating your progress.
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