I finally got my hands on a Butterfly Ball lipstick (I swear I was so obsessed I dreamt about these, which is a bit of theme for me with Lipstick Queen!) This is one sheerish coat of the shade Goodbye, a sheer deep wine. Does it brighten my teeth? I don't think it does in any noticeable way, but the turquoise shimmer gives pretty dimension to the shade without being frosty shimmer. As you can see, on my lips the shimmer is very subtle; also it isn't gritty and you can't feel it on your lips. I'd say the Butterfly Ball has a similar level of pigment to Medieval, and feels similarly comfortable on the lips; it's going to make a great option for me when I want similar softness to the Medieval but with a different shade and a little extra oomph. The deep wine shade makes me look a little bit consumptive, but in a good way; this lipstick has a pretty slightly gothic-twilighty feel to it.
I got this in a swap with a US friend; it should be out here in SpaceNK soon.