OPI - synonymous with "quality"
I've used OPI nail polishes for years & I have very few complaints! The colour selection is fantastic (although there are still a few colour variations that they never seem to get right in my opinion)
The collections that they come out with are usually beautiful, my absolute favourite was the Pirates of the Caribbean Collection . The colours were simply beautiful (think sea-foam green & gorgeous purples)
The few misses that I've had with OPI include the dreadful "shatter" polishes. Awful & tacky, they should never have seen the light of day! + every so often I'll purchase a beautiful looking colour only to find that it's so sheer that even after 4 or 5 coats I can still see my natural nail beneath several streaky layers =(
OPI does fantastic glitter polishes, they are super long lasting & stunning.
If I had to choose a favourite polish brand OPI would not be my first choice, if you had asked me several years ago I would have shouted its praises all over town but not so much anymore thanks to brands such as China Glaze, Essie & Orly. All of which surpass OPI in terms of quality, colour selection & longevity =)
For me for the price they are, I'd hope it would stay on longer. I have cheaper brands that last longer.
There are sooo many colours to pick from which is great. The bottles are nice shapes and easy to hold while painting and holding the bottle at the same time.
I really need to start trying more brands on my nails.