We tried one of these devices on Ms Lori's recommendation, but D did not like how open it was and how much access could be had to her cock. She did her standard test of using the Eroscilator to see if I would cum, and the answer was yes I did. So it got sent back and we have been using the #5a ever since. Our device is long enough so it covers her cock completely and no tampering can be done to receive any pleasure.
My understanding is that you could cum in any cage with enough stimulation. My only questions are if it stymied erections and was easy to clean and dry.
But that's the point, if the device prevents "enough stimulation" then you cannot come. Hence the effectiveness of the #5A, its thick and heavy, and doesn't transfer the stimulation to the areas that will result in pleasure and orgasm.
Big difference between an orgasm and a milking. Know where near as satisfying, in fact quite the opposite.