Today I have tried out AmazON... AmazOFF. In the bottle this looks like a very deep forest green type colour, which is similar on the nails.
I found this polish was quite thin. The first coat was rather streaky where the polish was so thin, meaning I had to do at least 3 coats. I did like the brush though. Quite often mini polishes have mini brushes, meaning it takes twice as long to apply, but the brush in these was a normal sized brush in a mini bottle. I love the colour and it dried nice and smooth and shiny, even without topcoat.
I'm not sure I'd pay the price for a full sized bottle of OPI from this swatch, but at £2 a mini bottle it's not too bad. Maybe the other colours will be better!