Logitech G400 has auto correction that cannot be turn off, i think not quite good with fps game like BF3

look for the one with logitech name on the box's stickers.

http://cdn.overclock.net/0/07/078e5662_1326660729400.jpeg

the one that has logitech name means the g400 inside has no prediction

sticker position does not matter. yours is prediction free

yup more or less the same. i find the lod of my g400 is lower than the deathadder i previously owned.
prediction is personal preference. some people prefer to have it to near non-existence level, some people don't even mind and can still do well.
xai is using adns-9500 laser sensor which is not that good for fps since it's inconsistent due to the 5% acceleration but it surely has a comfortable ambidextrous shape.

what kind of sorcery is this? 

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Added on February 4, 2012, 10:28 pm
kinzu, not xai.

Yup. Idra, de.muslim, f0rest, starix and a couple of sk gaming plus navi guys uses kinzu I think cArn uses kinzu too.