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Quoted from Tseini

G400 has tiny wires in the cord that breaks easily after few months use. So go straight for g400s (logitech sends you new mouse if this wire problem happens and you can still keep the old one though)
That wire problem causes it to randomly un-plug,plug in,un-plug,plugin. Though its ez to fix by buying cheah logitech laser mouse and changing the cable

have my g400 for a few years now (3 I think) it hasnt a got a problem with the wire. the wire itself was twisted, streched accidentaly but it still works as if its new.

I can vouch for the FK as well. Had it for a year now, and there haven’t been any problems. I used to have an EC2 eVo but the mouse wheel didn’t work properly at certain angles.