Just saw this and hopefully can give you some sound advice.
I bought the Zboard Merc Stealth a few weeks back and ended up taking it back and swapping it for a G15.
The merc is a nice KB, solid build and nice lighting, but a NIGHTMARE to use for anything other than gaming. Seriously if you plan on typing or using the num pad, forget it. Typing is a pain in the a$$ as the keys are close together and set to the right of the keyboard so it really feels uncomfortable. If you have big fingers then you are in for even more pain.
The NUM pad, or lack there of was the breaking point for me and this KB. The numbers and home, delete, pg dn etc buttons are grouped together so say you want to input some numbers you do so, but then when you say when to del something using the del key, you have to hit the num lock and then del.
I do a wide variety of things on my PC including graphic design and I just couldn't deal with having to hit the NUM lock key every 5 minutes. It truly drove me mad. At one point I was cutting images when I should have been deleting them, and inputting numbers when I should have been cutting. Just painful.
Another annoying thing I found was the USB cable was so dam thick its is like the thickness of an extension cable, this is because the have bunched the sound and USB cables into one, kinda k@k if you ask me.
This been said as I mentioned it is a solid keyboard, FLIPPING heavy and sturdy.
Bottom line I found that this KB is great for FPS gaming and the lights look nice, and that’s about where it ends. If you play games like DOTA or other strategy games, its going to be a real challenge. I tried a few games of DOTA and its just no go. So the gamepad section really only works well for FPS.
I think I decided that fancy keypads and fancy lights are just a gimmick and actually make life more challenging for gamers
Anyways hope that helps a bit.
And on that note I would really recommend the G11, its pretty much exactly the same as the G15 just with no screen.