I bought a TuneBot about a month ago, and I love it! I think it's a great tool to not only help tune your drums, but to also help tune your EARS. I think this is the part that people are missing about this thing. I've only used it about 4 or 5 times so far, but I've already noticed a difference in how I hear the drum while tuning. The reason is quite simple really, it gives you a visual respresentation of not only the absolute pitch, but also the relative pitch between lugs. This visual respresentation combined with what you hear is what makes it such a great learning tool, and it reinforces your learning of how to tune. It's kind of like how the Rosetta Stone language stuff works (minus the speaking part of course).
Frankly, all of you who knock the product because you already know how to tune perfectly by ear, well, good for you. Give yourselves a medal. I also know how to tune by ear, but this tool gives me the ability to do it faster, with more accuracy, and provides highly repeatable results, with the added benefit of helping me fine tune my own ear.
By the way, the more I use it, the easier and faster I can tune a drum. It's really not hard to use once you get the hang of it. I can tune a drum much quicker now with it than I could back when I didn't have this thing.
That's my 0.02