The Ducky Shine II is more expensive because of the programming they put into the board that is saved even when you unplug the board. It has 2 customizable user profiles, a reactive lighting mode, marquee mode, breathing mode, tenkeyless, fullsize mode with 5 levels of backlight, all programmed into the keys. That takes a bit of figuring out to do. There is no other keyboard with these lighting features, and also to make they keys they have to first mold the key, paint it with enamel, then remove the enamel for the legend.
It's also NKRO over USB, and theres a set of dip switches on the back where you can change various settings and flip certain switches.
Another thing is that it's all standard stuff, meaning you can easily get any cherry mx switch keycaps and it should fit right in.
Downsides Dual layer PCB means that to clean and take apart switches you must desolder each one.
Finding custom backlit keycaps are hard, only options are Feng (here on GeekHack and on eBay) for semi-clear KBC's, and custom ones. Ducky said they might release them soon, who knows.
Also its a low-speed usb connection. Meaning that it may have up to 8 ms of latency.
CM Storm has 1 ms, which is more optimal for gaming.
I really like the fact that I can have certain keys light up and not others for certain games, so I can keep my hands where they need to be.
If you love backlighting this is the keyboard for you, it has the most features on the market right now. It is a bit pricey, but the worst part is finding them in stock. Anyways, good luck!
The CM Storms are nice, and decent bang for your buck. If you want to game more, then get the CM storm. Personally, I don't like any of my stuff to look like "gamer" stuff when I have people over, so I go for the discrete route, but if you don't care, then that's fine
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