Alright, so I basically only use this toy for my personal use for masturbation in my dorm room. For that purpose, it has been absolutely amazing. For me, it feels great and it always manages to get me off. In terms of improving sexual performance by building stamina, I can't really say that I have noticed much difference. There could be some improvements but if there have been, they haven't been noticeable quite yet. 

In terms of the material, it's made of soft and pliable Superskin™ material. This masturbator is also phthalate-free for safe and healthy play. Tucked inside a discreet flashlight style case is a realistic vagina opening, lined with rows of stimulating nubs that treat your erection to amazing pleasure. Twist the cap on the back to vary suction as you slide in and out for a customized experience. It feels really soft to the touch and I use it in junction with the special renewal powder, which is simply 100% cornstarch. This does keep it really fresh and soft feeling. In addition to that, it keeps it smelling good, which is always a plus. In terms of keeping it clean, all I do is take it into the shower with me after every use and give it a good rinse and cleaning with an anti-bacterial spray that I bought along with it. Then, I let it dry in my closet and once it's dry, I'll add the renewal powder (corn starch). This keeps it really clean and to be honest, I think it looks and feels just like it did when I first got it.

The case is also very good. Now I have found that I can be a bit cumbersome at some times, like when I put it somewhere, it really takes up a lot of space. With saying that, it's not really that big if you considerer what goes into it. It is properly sized but the case does add some bulk. It's not hard to find a good place to hide it but when you're just finished with it, then it can be hard to deal with.