My goldilocks cup is the large Fleur. I was a bit skeptical about how the SuperJennie could work better. At first I found it a little harder to open. It took some fiddling, but I got used to it. I use the punch down fold and coudn't punch it down all the way because it wouldn't pop open as easily as the Fleur. By the end of my cycle it was as easy to insert as the Fleur.
For the first time in a long time I had an accident-free month. No overflows. I think this could be a combination of two things. One, I was being paranoid and emptying it any time I felt the slightest bubbling, and that was usually at 7.5mL. Two, my cycle alternates between angry river and silent flood. I was on angry river this month (cramps, but lighter flow). I only completely filled the cup once, (overnight) and I wasn't able to see how full it was because I was sleepy, wasn't used to the cup, and dumped half of it in the toilet trying to remove the cup. Removal got easier too. I'm curious to see if I can wear it overnight without leaks on a silent flood month. With the Fleur I usualy have 1 or 2 nights that I have to get up and change it in the middle of the night.
The cup measures approximately 37mL to the holes and 41 to the top. Although I don't need the stem I might just leave it because it didn't bother me at all.
Feel free to ask me any questions.