So I had the chance to go to Korea this past July and I managed to pick one of these babies up with Cherry MX Reds. I opted for the grey colored keyboards as I didn't want black and the white seemed to get dirty. Typing on it, I gotta say, (coming from blues especially) I have definitely found my favorite switch. It'll be hard to go back to blues. Typing is so much more smooth, far less fatiguing (not that blues were that fatiguing though to begin with), and the media keys are a definite luxury to have.
I opted to get the PBT caps with the korean text as well, because, hell, why not? The key caps feel nice and definitely have a good texture to them in comparison to the lame ABS ones on the CM Storm. In regards to the Cherry vs. Costar stabilizers, I'm really not sure what to say, since the only reason I liked the costar stabilizers was because I thought they had a nice clicky feedback, whereas now, I'm thinking that it was just the blue switch that caused it. To be honest, they seem the same to be, and the Cherry stabilizers do make it a lot easier to remove the space bar, shift key, etc.
In terms of the weight and build quality, it certainly feels nice and heavy, and absolutely solid. I also love the rubber feet (since the CM Storm I had didn't have them) and they do definitely help in terms of keeping the keyboard in place.
Typing wise, the experience is definitely like what the pseudonym for reds describes. I'm probably around ~90-100 WPM on average and getting better as I use it more and more.
If EK gets these any time soon, I wouldn't mind recommending it to any potential buyers. Although of course, since the Filcos with Reds have already come out, I don't see why you would wanna wait for this keyboard either. But heck. A good keyboard's a good keyboard.