i had just had hands-on experience on quality fake SGS III this morning, still have it with me, belong to my colleague.
this is nuts, the fake SGS III i tested using quadcore qualcomm MSM8960 1.4Ghz & PowerVR SGX531, antutu score: 12600! , 1GB RAM, quite good 720p screen, quite good back camera.
and it have physical appearance 95% of the real SGS III. i think unaware long time android user would fall for it if they don't own SGS III themselves.
but all those goodies comes with downside like: play store force closed, until this very moment still haven't able to access the google play store
the front camera is badly compromised. the samsung logo on the front and back of the phone have minor flaw, and the home button isn't as good.
i'd say this is a very serious copy of sgs III.
update: no gyro on this device
http://i166.photobucket.com/albums/u81/leithq/IMG_20130327_140757.jpg