Recently picked up the Stamina training unit from the online fleshlight adult toy store and have been using it regularly for the past couple months. The first thing that grabs your attention is how lifelike the fleshlight actually feels and responds very similar to human skin, maybe just a touch more supple.
I chose the stamina training unit due to its rough rivets inside the canal which are designed to stimulate your penis and glands in a very intense way which can take great control for you not to get carried away and bring yourself to the point of no return.
This is the power of stamina training unit, the fact that it really forces you to control your mind and your body, because if you lose control and begin thrusting like a wild bronco it's over in a matter of seconds. This fleshlight has helped me control my mind and keep track of how the stimulation affects my pelvic muscles and recognize different levels of arousal so that I can back off when I notice increased heights of arousal.
The best way to exercise with this device, is to start of slow while paying close attention to your pelvic muscles ensuring that they don't contract without your consent. If you feel them contracting involuntarily, that is a clear sign that you should back off and regain control.
It's very natural to find that the feeling from the stamina training unit will actually be more intense than real sexual intercourse and this is what makes it so powerful to train with by making your body accustom to high levels of stimulations which make regular intercourse a piece of cake.