I do not own a CM quick, but I do own a Red Leo and I must say that I prefer the overall look of the Leo. Less logo, more of a minimalistic look (less the LEDs).
Leopolds also have a pretty good build quality and I rarely see bad reviews or experiences with them. -And also, I'd prefer to deal with Leo than with PCHome, but that's just my opinion...-
All in all, like I said, I do not own a CM quick, but Leo are well built, not too pricey and after changing the keycaps are really nice to type on.
NOW, about qtan's keycaps, I do not know if they are made to fit the Leo space bars. New models (with both stems type) are now produced and available, but you should check with him directly, since I didn't find a pic on his site that shows the inside of the space bar.
Hoping it helps you out.