Give it a pat on the back.

If I decide to keep it, should I play with win sensitivity, or just lower in-game sens ?

Can I expect to have same feeling still ?

I read somewhere that it's even better to have higher dpi and lower in-game sens than the other way around. Not sure if that is credible though.

Also if anyone knows some good sens calculator, it would be appreciated.

There are actually fake mice?

Wow.

Apparently. I researched it AFTER I bought this crap.

Worst thing is, it feels and look as original, wouldn't say it's fake just by using it (maybe side buttons seem to be slimmer, but that might be on chroma by default, since I have owned only 3g so far, which lasted me for over 10 years).

Read this: https://www.reddit.com/r/razer/comments/4hyqo..._anything/

I will try that.

To answear your question regarding dpi, supposedly higher dpi is better (depending on what resolution you use obviously). If you play on very low res, dpi don't matter that much, high res and yes dpi can play a part in precision. I think this is more noticeable in a game like CS though. If you play @1080 I'd say 800dpi should be about as low as you should go. Obviously it's all a subject to preference and I'm sure here are ppl on Esr who can explain the mechanics behind all this in greater detail and make it easier to grasp.