While the colours are unique, I would'nt buy AA nail polishes again unless I can find them cheaper. They are glossy, creamy and well pigmented, but they don't last long and the brush is the biggest let down. It's way too long. Globs of nail polish dribbles down as you apply. If I'm too slow, I end up with a layer that floods the cuticles.
If AA improves their brushes, I'd think they are worth their UK RRP. I would never fault them on their colours though. They are amazing!