I bought some insteads, and so far so good.
I think I've inserted them correctly - I can't feel it, it's behind my pubic bone, it stays put and doesn't leak (ok, it does when I use the bathroom, but doesn't keep leaking when I'm through. I think that part's normal?) but when I try to take it out, there doesn't seem to be any blood actually IN the cup. Some blood will go into the toilet, and the cup itself will be messy (both sides) but the reservoir isn't actually holding anything.
I have to say I can't really wrap my head around how a person could possibly get the thing back out with any liquid in the cup in the first place, but it sure has the capacity to hold something! And people have mentioned 'pouring' or 'emptying' the cups in the toilet...
So could I have it in wrong even though it doesn't leak?