I own one Revlon Nail Enamel in a silver colour, and it's pretty good at staying on your nails and not chipping when worn with a top coat. I've been meaning to buy 'Minted' but everywhere I look it seems to be sold out so their colors are quite popular.
My only gripe is their brushes, with OPI's brushes you can easily apply polish in 2 / 3 strokes per coat where I find Revlon's brushes are quite thin (I also use their rapid dry topcoat which is the same) and can be a bit more prone to streaking as I use more brush strokes.
But for around $17 they're a cheaper alternative to OPI, with similar lasting length (I would say OPI quality is much higher), just lacking in a large colour range.
I have had several of these, the only one i have left is the pinacolada one that i got on sale.. so far has not clumped but has gone on a bit thick, the glitter in it hasnt been good on my nails so have not used it as often and the pinacolada one has a very strong unpleasant smell.
Tips: dont buy pinacolada revlon anil polish unless you like strong synthetic smells and lots of glitter...