I recently purchased the Challenger Ultimate, overall I am very happy with it. Easy to use, very responsive..and the little hand fan is just great. There is just one small issue. It was all working fine, and I had change the backlight colour to my liking using the software...and it was all good until I accidentally rest it to its default settings. Now, the software doesn't seem to want to cooperate with me. I go into it to change the colour to what I want, press apply then press ox/exit to go back to the main menu and it automatically changes it back to the default red and turns the logo back on. I have tried going into all the different profiles, and changing the profiles on the keyboard but it keeps doing the same thing. I also tried uninstalling and re installing the software, and the keyboard itself. Also I noticed, before I accidentally reset it...whenever i would press the profile change button on the keyboard, it would flash up on the screen what profile i was switching into...it doesn't do that anymore either. It's not a huge issue I suppose, just really rather annoying.