Some colours are better quality than others.
You will always get the issue with nail polish chipping or ending up gluggy when the bottle is getting a bit old but as I say, some are better than others.
Over all they are a quality product. I love how they have a really vibrant range of colours, if you are looking for a very specific shade of whatever, you can always look to OPI to find it.
Opi has a huge range of colors, any colour you want they have.i found this brand is abit thicker then other brands pretty bad for chipping