I had a G400, but it got the cord problem and started disconnecting. I RMA'd it with no hassles whatsoever, and they sent me a new G400s in the main within the week.
Besides looking stupider, it's the same exact mouse. Sensor can also go up to 4000 dpi, which nobody plays on, so it doesn't really matter. The stock 800 dpi still has the best tracking I believe as was with the G400. It's got a nice shape, comfortable, sweat doesn't show up on it, and its stock feet have a nice glide.
10/10 would recommend.
If you're getting one new you might as well get a normal G400, because there's really no difference except ~$25