Working in the Cosmos II was a lot like working in the 800D, but with more room behind the motherboard tray. Before getting going I pulled both side panels off to make for more room while working in the Cosmos II. Dropping our Assassin motherboard into the Cosmos II went smoothly, something that very few cases can do because of its XL-ATX size. The only challenge I ran into while installing in the Cosmos II was the amount of wires you have to deal with. The front panel fan controller is wonderful but it would have been nice to have the included fans pre hooked up. Beyond that wiring was simple due to the amount of space behind the motherboard tray. I was especially impressed with the space behind the hard drive cages, even though I wasn’t hooking up a collection of drives, there was more than enough room for the wiring.