First of all this is no replacement for a Tune-bot, its much slower to react and the results are not nearly as consistent or useful. If youre getting serious about drum tuning and dont want to spend very much this app might be helpful. I have four rack toms and two floor toms, I tune them in major thirds. I can get them to exact frequencies with Tune-bot but not using iTuneDrums which allows me to get in the ballpark but not right on the target note. I like that this drum tuning app lives on my iPhone so I have it with me all the time. iTuneDrums has an interesting readout of information about the sound drums make. It is unlike torque wrenches because it is based on sound not measurement of physical tension or pressure, it measures the sonic results of these physical measurments which is what your ears do to when listening to drums. At $5 its worth the investment to have another viewpoint of the sound and pitch your drums are actually making. If you tune your drums by ear iTuneDrums can tell you how well your ears guided you to the end result, like Q.C. for your ears and pitch. It is fascinating to see on the app how a harmonic can be louder than the fundamental tone of a drum and how the smallest turn of the drum key can change the overall timbre produced.