I know in general people think Xarmor keyboards are not the top quality ones. But to my experience, at least for this particular one, it's pretty good. So far I have used Blackwidow Ultimate, DAS, Matias Tactile Pro 3 and this U9BL. I would say U9BL beats blackwidow, which is the worst one in my experience, and matias, which doesn't have the consistency among all the keys. Comparing to DAS, this U9BL is a little light to type, and the click is more crisp. But DAS does have a little bit more solid feeling, but not that obvious. Overall, U9BL may not be the best blue switch keyboard on the market, but could well be the best one with backlit -- and its backlit is done very well: even brightness, adjustable, which you can see from my pictures.
Overall it's a pretty high quality keyboard. I wouldn't have let it go if I were not getting another custom mac layout keyboard.