I find that Formula X (unfortunately being discontinued) lasts the longest and best on me. I always use a base coat (Essie) and top coat (SuperChic). Formula X will last upwards of 12 days on me which absolutely no chipping, even with rough hand use. It's ridiculous. Behind Formula X is OPI in my opinion. It ends up wanting to "peel" around the edges which then gets caught in my hair and I cause chips. But that's not until 7-9 days.