Lighting & OLED Display
The lighting on both the keyboard and mouse is excellent. On the keyboard the pudding keycaps really make the lighting look amazing. You basically have full coverage and the silver aluminum top-plate does a great job reflecting the light.
On the mouse the RGB lighting is quite bright and the opaque design of the shell really helps diffuse everything.
By default the OLED display will display an image (the default is the SteelSeries logo) and you can go into the software and import or even draw your own image to dispay.
What is cool about SteelSeries is they have a bunch of Apps that work with the OLED display. For example there is one called System Monitor that will show your PC stats in real time!