FYI, the USB port on it is just a passthrough (it has 2 cables, one of which is specifically for that). I figured that I may as well get a wired mouse since I have to run a cord for the keyboard anyway, the mouse can use the keyboard's extension, and wired mice have lower latency and don't eat batteries. I am not willing to install extra software for the mouse or keyboard, hence part of the reason for not wanting extra features. (Actually, the corsair K70 doesn't even have software.)
The G400s looks like a newer version of my MX310. (Which even has the same app switcher button that doesn't seem to work without extra software that I won't use.) FWIW, the only problem with the MX310 is that it's getting a bit creaky at times and moves slower than I'd like even on the max setting - and I don't like the pointer curve that results from disabling 'enhance pointer precision'. I happen to be using the keyboard and mouse from a Logitech MK520 right now - not a huge fan of scroll wheel on the mouse (I had a LX7 with a similar feeling scroll wheel, and the wheel failed after a while) or the lack of browser buttons.
Also, FWIW, I'm not opposed to spending a premium on something if it'll last a long time. (I hate throwaway items.) The G400s looks rather pricey, but then again, so is the K70 - and I'm hoping that'll work well for the next 15 years or so, maybe more if I can get away with it. It seems like my rubber dome keyboards start wearing out noticeably every 5 years or something... ughh...
"Well Diane, I have an exclusive story. And I... can't figure out how to check my e-mail from home. / Did you check your TCP/IP settings? / Yes I did, Ollie. / Enable cookies? / Yes, Ollie. / You want this dog? / No thank you, Ollie."