I bought my first one maybe 5 years ago. It was great. I almost blacked out once! I wore a hole in it though. So I ordered a few more. If you're wide like me, 6 inch girth, the standard size is ok if you use a good no-oil lube like Corn Huskers Lotion. I got curious and also bought a wonder wave with a narrower channel, and it was a bit too tight and too intense on my uncircumcised foreskin. One I bought was clear, but it yellowed and clouded up, no matter how I clean it. The cases are pretty good in that they allow you to vary the amount of air that flows into the holder, so you can get quite a bit of suction on the outstroke, sometimes making loud pussy-farts. It is plenty long, about 9 and I'm about 7.5.