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I installed the software from the Oversteel website and had a fiddle with the RGB settings, you can also change these directly from the keyboard if you don't want to install the software. Personally I'm not bothered about RGB so I just use the 'breathe' setting, but there are all sorts of fancy effects if that is your bag. You can also turn it off if you want.
The keys/switches themselves are great to use although there is a slight metallic resonance if you hit the keys hard - it's not particularly loud and I only notice it if I am listening for it.
Another reviewer mentioned that they had to unplug and plug the keyboard in every time they rebooted their PC - I also had this issue initially but after attempting to update the drivers (Windows didn't actually seem to update ) it has been perfect and I no longer need to do this.
Overall I'm delighted with it, and I would get another no hesitation if i needed to, even at the new higher price! I also got the Magnox mouse from Oversteel at the same time and this is also great quality for the price!