Holy shit! Never had this feeling in my whole life. It's feel better than my first cum and it's get even better every time when I use it. The cum is so explosive that my soul reaches the heaven where I get to see my granny and grandpa. Never regret getting it!
This is the 2nd fleshlight I have purchased (first being the Kissa Sins insatiable), and the STU really surpassed all my expectations, and then some. I'm not sure how much of a "training unit" this is, as I was able to last relatively long on this one without difficulty despite many other reviewers claiming differently. The sensation itself was pleasurable, arguably more so than my first one. Only gripe is with the suction cap at the top, which does not seem to be a perfect fit as I would always have bits of lube running down the handle of the fleshlight with each pump.