OPI have a great colour range & bring out amazing limited edition sets to match whatever trends are in (eg: movies, colourways etc) so i have a huge collection!
But i have found that if you use the full range (#1 basecoat or strengthener, #2 colour & #3 top coat) then you will get great vibrant results that last for up to two weeks BUT if you use other brand base or top coats your paint will start to chip within a couple of days.
I have also found that when applying colour you need to apply more than one coat otherwise a majority of colours will be slightly transparent or streaky - the second colour coat makes the finish much more even.
Overall i feel they are a very strong product and great quality , they just need to be used with their own range of support polishes or treatments :)
I have a 50/50 review for this.
When I go to a nail salon and choose an OPI colour it's last 2-4 weeks. I love their massive selection for colours! They have gorgeous matte colours, shiny and glitter formulas! So I'm really pleased with that.
But... my own OPI that I own are o thing compared they chip after 3 days wear and act like any old normal polish I own.
Tips: My tip would probably be go to a nail salon! Or mat e try a top and bottom coat. I definitely will be and update my review once have!