It's really brilliant once you get the hang of it. I realized it was time for a change when I'd mastered insertion but was still left with all sorts of leakage after overnight usage. After 5-8 hours of sleep, I wake up all fine and dandy (and dry), until it's time to actually move my lower body and the seal loudly breaks, alerting me to the GUSH (sorry for the descriptive visual) that is soon to follow.
The Femmycycle really looks to be the spill-proof answer to my prayers. Anyone tried it?