Personally of all the ranges I have used the best I've found is Jessica - it's not suprising they won the 2008 InStyle best beauty buys for Best Nail Varnish Range. The range of colours is amazing & when applied properly, i.e. using the Jessica method, lasts forever.
Their base coats & top coats are also fantastic, hence why they likewise are award winners (winner of the InStyle award for best topcoat & Cosmepolitan award for best nail rescuer).
To my mind & countless other salons & spas they are UNBEATABLE!!