It took me a while to figure out that you need to let it dry for quite a long time. I would say even 10 minutes or more. It partially dries, but then smudges if you apply any kind of pressure on the nail. If you do it right it looks lovely!
Also, I found some stickers disintegrate when you wipe them with the brush and product too much, so when I'm using stickers I try to do it in 1-2 strokes, so not to make the color come off the stickers.
I would say I'm quite happy with this, as with most Sassy products I've tried.