I always find No7 polishes a bit frustrating. They have some great colours but I hate the tall bottles and the brushes. It's impossible to keep the rim of the bottle clean and the brushes don't spread over the nail as you swipe so you have to swipe at least 3 times to cover the nail.
But, as I said, the colours are amazing and this one's no exception. It's the boldest blue I own and I love it.