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Last week my sister's family stopped by our house on their vacation. My two nephews, 14 & 12, were introduced to RPGing via the BoL game.
I ran a simple fantasy style game using BoL rules - they played two dwarven brothers adventuring in the land of Elyntia (from The Fantasy Trip). The rules were perfect (though I did change weapon damage to d8,d6,& d4 so that they could use their different dice) and the game played very smoothly.
BoL has rapidly become my and my wife's favorite system!
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You should check out Simon's BoL Hack - it does a great job of blending BoL with old school d20 and makes good use of different dice.