Yes me have one, and Im finding it a very good piece of equipment,use it AM and PM 30 breaths each time, and it can be hard work, depending on the level you have it set on.
I have also used it as a warm up device, to get the lungs going before a cold morning.
Since having the power breathe I have found my breathing to be alot easier.
Is it all in the mind........probably, but im happy with the product and I will continue to use it.