To get things straight off my chest, I'm a huge fan of Leverage the TV show, and a hardened RPGer. However I'm not much of a fan of the Cortex system, I have The Cortex main rules and the Serenity game but really I think the Savage World system is better. This game has changed my view of the Cortex system, all the stuff I never really liked has been stripped away and we have a lean, mean system that reflects the TV show very well.
The system has been modded to perfectly emulate the concept of a crew pulling heists. Plot Points which I never thought were covered in enough detail in previous games, get more detail and involve the players more.
Attributes range from d4 (bad) to d12 (amazing), as do the five skills (yes five skills! Leverage breaks a crew into 5 specialists and the game follows suit). Everything is kept lean yet there is still plenty of dice rolling to stop your hands from getting bored.
MW have also produced plenty of supplements to expand characters and also provide much needed campaigns to get a Gm started, all I of which I can recommend.
My advice, get your players to watch a few episodes first, let then them go rob some bad guys.
[5 of 5 Stars!]