Enjoy it if you havent already played. Quality take on the hong kong movies of yore.
I'm only five hours in and I'm enjoying my time with Sleeping Dogs. ;) The "environmentalist" combat attacks are truly amusing! The last time I was entertained by a similar type game was with GTA Vice City.
i think its got something beyond that though - atmospherically, and maybe even culturally in its differences. the triad / cop levels also make it interesting a la mass effect (though im not sure if theres any effect on outcomes to the story)
edit: glad yer enjoying it tho