I picked up this No7 polish using a money off voucher last week, it's one half of a current collection of glitter top coats, Sun Rays which I showed you previously is the other.
I don't think Disco Ball is the best name for this polish, yes it's sparkly but it's not the most sparkly polish I've ever seen and to me a disco ball would be pure silver whereas this polish has a sort of lilac lean to it and almost blue toned glitter pieces depending on the light.
It applied nicely and although it's supposed to be a top coat it's fully opaque in three coats, you might even get away with two if you were careful. Unfortunately it's chippy, large pieces peel off the nail fairly fast which makes this a night out polish rather than one to wear for any length of time.