You don't even feel it once it's in, unless the stem is too long but you can cut it down. I was worried about putting it in and taking it out, but it actually wasn't too bad at all. I tried before my period started and that was more difficult, so the uh...lubrication definitely helps.
The best part about it is just not having to worry about it leaking during the day, and not having to take it out whenever you pee. It holds an ounce and we usually only bleed about 3-4 ounces throughout the whole cycle.