I was upshifting very fast and when I putted in 6st gear the bike went in neutral and there was also this horrible noise coming out of the gear box. Anyone else experienced this?

On every bike I've owned. Shift like you mean it.

I've had a false neutral between 5th and 6th, this only happens when I'm not to positive on the up change. Still haven't adjusted my gear lever position, will do it when I get back to work where my tools are.

i havn't had this happen on my 10 yet , but had it happen a few times on my zx6r

This is one of the reasons why I turn mine upside down. Never a problem.