So I'm trying it out now. I have the worst time keeping it folded until I can insert it. And the directions say I should turn it once while it's in to make sure it's opened up, but I haven't been successful in doing that (though from reading another post, I guess maybe that isn't really necessary?). It's perfectly comfortable so far. I'm at the point in my period where my flow lightens up a lot, so hopefully I'll get it all figured out now and be ready for next time.
It'll be interesting to see how I do at the dojo tomorrow.