All I gotta say is Casey's customer service is A-1. My 1st problem came when I did not receive my training mask 3.0 Unit Casey had it immediately shipped out and gave me an answer through Email mind you in less than an hour. When I received the UV Sanitation Case it was making some weird noise while charging so I reached out to casey once again and he answered in 10 minutes with a solution that worked !!! As far as the product goes it definetly puts the extra resistance on your body to produce better results if you put in the same lvl of intensity. It definetly helps with breathing control as well as RMT. I'm gonna say this do not start your fitness with this as its an advanced tool and adds extra resistance to whatever you are doing.