I own all three of those mice tho and they're dogshit. Just because a mouse has a "flawless sensor" doesn't mean it's ok. The kana v2 would be nice without sidebuttons though.
Logitech shits on you when you try to rape a legit RMA out of them, the faggots. Also kudos for them for making 2 eurocent chinese junk and selling it for a price of a decent product.
Logitech was something until the end of the MX518-era. Those days are gone.
I have no idea about your experiences, but when my g400 broke they sent me a free g400s within the week. admittedly it's not as good, but I still respect their customer service based on the way I was treated.