Hiya Arienai 
The Jessica Rabbit 2.0 was actually my first rabbit too - high-five!
It is a noisy toy, but nothing that can't be muffled under a blanket, with music playing. I had it in uni walls, where the walls were like paper, and none of my flatmates ever complained (though we barely ever spoke, so I don't know if they ever heard anything). The beads clicking in the shaft does make the toy considerably louder, but they never did anything for me so I always left them switched off anyway..
It's a very decent toy, but I admit that it doesn't actually get much use now, because it is far too big for me to take without being, er, warmed up, and also because the angle of the ears were wrong for my anatomy. Plus I now own a Lelo Gigi, which is much quieter and I find the vibrations more pleasurable.
To answer your question, it always stayed in me when I took my hands away, but it shifted so the rabbit ears moved out of the right place, but again that could just be how I am down there.
However, I don't regret Jessica being my first (oo-err!). It is really good, and I've had some good times with that girl
But if you are willing to splash a little more cash, I would say it's worth it, just because the quieter toys tend to be the more expensive ones, and for the peace of mind of not being caught, it might be worth it. I've never, EVER used my Jessica at home, even with music on.