I have tried a lot of masturbators but the best have three attributes: spinning, thrusting, and a sleeve that stimulates not only your shaft but also, very importantly, your head. The Xshell does them all. The sleeve has nodules that are perfect and at the bottom there are bump nodules that stimulate your head/glans. The length of the stroke is perfect and it spins fast. There are some other benefits: The device is small relative to other devices and tapers at the end so it it easy to hold in your hand. It is tight- many devices have a larger diameter sleeve, but Xshell’s is a bit smaller and that makes all the difference in the world. The entrance has pussy lips that when you stroke adds an extra stimulus to your lower shaft. Finally, the device is well made- mine has lasted two years and it’s still perfect. Check it out at link