I won mine from a contest months back. There have been 3 things I noticed in my sample. 1. Sticky shift key. It has been like this out of the box.
2. Mine for some reason does now work during POST to access the BIOS. however other keyboards work just fine. 3. I got the combo. The mouse stopped changing colors when in Windows. However during boot up you can see it cycling. No key combinations would let me change it back to before.