I am fortunate that I am about as perfectly average in size as possible (5.2"). This means that all the cups I've tried so far, I fit perfectly, and can fell the entire device when full inserted. I decided to try the SD, which has a smaller insertion length. Knowing that I would "bottom out" some, I was looking forward to WaveGliding session. I was able to glide several waves, over the course of 25 minutes, each one bigger than the last. Eventually, it was time to "wipe out", and fill the cup. It was certainly one of my more explosive sessions. I have to admit, the concept of a disposable cup goes against my environmental side, but wow, it sure is worth it.

I saw that this cup had different dimensions than the other ones I'm used to, so I thought I'd give it a try. For those used to the non-SD cups, you'll probably be able to tell the difference. I personally found it a little too tight for my tastes, but let's be honest...it still felt good! I'm still giving it 5 stars: just because it didn't feel as good to me as the others doesn't mean it's any less of a quality cup.

Same pleasure that the original provides! Fits my shaft much easier. I’m smaller than average, and leaves a lot less empty space. Easily would recommend this if you find the original too large.