I've tried a few different colours from OPI and I think their selection is amazing but I don't think the quality throughout the whole range is overly consistent.
Some colours I've tried are awesome and have amazing lasting power, but some end up peeling completely off my nails by the second day of wear.
An awesome positive to OPI that i've found is that none of them have stained my nails, which is amazing. Almost all nail polishes apart from OPI will stain my nails and I hate that, so avoiding stained nails is a big thing for me (especially when i'm so bad at remembering to use a base coat).
I would totally recommend people trying these out, it's worth it for the colours and selection, just not always the lasting power - but everybody's different and may have amazing results with each one they try :)
i love collecting OPI its kinda my thing now. colours are awesome and turn out how they look in the bottle. But if you want your colour to last and not chip, you have to buy to good base and top coats, you wont regret buying them.
Tips: spend the money on a good base and top coat. you wont regret it.