Summary: I tried this keyboard as an upgrade from a super cheap one, an wow, what a disappointment. It wasn't level and wobbled slightly as I typed. The only sensation I can compare this to, is typing on a piece of damp cardboard. Very unresponsive, muddy keys. The tiny Shift key also causes lots of mis-types. And now I can't return it, because I've opened the box. What a waste. I'm still a fan of Logitech products, but man... Reviews can be misleading.
Summary: I've had this keyboard for a few months and thought it was great. Then I decided it was a bit dusty and rinsed it off in the sink quickly under the water. The next day I plugged it in and now it doesn't work anymore. I guess if I wanted a keyboard that gets ruined under water, I could have bought any old keyboard. Not happy.
Summary: The K310 dedicated for Polish market looks like UK layout (they call it US international version for some reason). In Poland we almost always use the US layout - just like the one on the marketing pictures everywhere - you can't buy that one anywhere here. As they are now - they are unusable and I already returned mine - of course every shop (including official Logitech shop) uses the US layout picture to sell these keyboards.