Bests & Worsts Reviews from Amazon

This Brand/Model comes in three levels of resistance: LR (low resistance), MR (medium resistance,, and HR (high resistance) and some of the listings on Amazon were unclear about this when I shopped. Unless you are a large competitive athlete, you will probably want the low resistance level. The enclosed instructions are adequate for basic use of this device. Your only need the "Breathe Strong Perform Better" book if you want to push this form of conditioning to the max. Here are a few suggestions/warnings not in the instructions. (1) As in any new exercise, start with just moderate exertion and gradually increase the exertion over several weeks.. (2) If you need the nose clips and find them uncomfortable--as I do--just hold your nose closed with one hand. (3) When washing the device twice weekly, I suggest boiling water for two minutes in a covered pot to sterilize it and letting it partially cool an hour (to the point where it is warm but not hot) to minimize the chance of mildew growing within the device. (4) If you find yourself loosing the count to 30, set a count-down timer for three minutes and watch your progress relative to it. Does it work? In five weeks of almost twice daily use, I have progressed from the zero setting to the "one" setting of the Medium Resistance device, which is approximately a 70% increase in force. I distinctly have more "sucking" power when using my Advair Diskus asthma medication. And I seem to have a bit more "wind" when jogging. I plan to try build strength for another month or two, and then switch to a maintenance schedule.