I have a few of these as I've either been given them or purchased them at a discounted price because I keep forgetting my opinion on them. My opinion is that I don't like them, so let me tell you why.
They're not cruelty free. Not that this is a big thing in my decision making at all, but I know for a lot of people that this IS a big thing. Another reason I don't like them is the staying power - with or without a base and top coat - I find they only last a few days, 3 at most before I start to see chips.
I have a few shades, but the names escape me. I have a lovely red that reminds me of Dorothy's slippers, a blue that dries kind of like a sand (I especially hate this one), a very baby pink and a shimmery sheer white (I like this one but it's super hard to remove).
They apply nicely and I find the formula mostly opaque but the fact that they don't last more than 3 days on my nails is a bit of a shame and well, I prefer other brands.
An amazingly good quality product. These nail polishes are more expensive than others that I have puchased but they are such good quality. I buy them when on sale and that makes them really worth the price. Compared to other products, I found OPI to be superior in all aspects. The product glides on smoothly, dries in no time and lasts longer than other brands I use. I find that I only need one coat and with a top coat it lasts ages and the product doesn't chip either.