And yes, Private Show is a Butter London The Black Knight dupe. This is perfect for me because I've been lemming after The Black Knight for a while. I just haven't been able to bring myself to spend $14. However, a $1.97 is very doable.
Formula wise, it's good. Sometimes you get what you pay for, but in this case, you get good quality. I have actually never had a problem with my other Pure Ice polishes. This was two easy coats and two coats of top coat.
I'm really happy with Private Show. It's gorgeous and it doesn't make my wallet sad. I'd suggest picking it up while you can because I'm not sure if it's a permanent color in the Pure Ice line. You can find it at Walmart.