I needed about two coats to get it opaque, but you might maybe want three, since it is a bit runny (nothing I can't live with, though). To my pleasure, it was not a pain to get off with nail polish remover. On the pictures I have no top coat on, and no base coat (though I later added a top coat by Dior).
At first, I didn't like how big the brush is, compared to the classic OPI brush, but after about two or three nails, I actually began liking it. You have to be careful, though, since the brush can deliver way too much polish.
Here you can see the difference between an OPI brush (left) and the Sally Hansen - Insta-Dri brush (right). The SH one is also a lot longer, as you can see.
Overall, I really, really enjoyed this nail polish, the colour is adorable (I've been getting comments on it from everyone!) and the formula is good, too. I will definitely try out more shades from the Insta-Dri collection.