Recently my Quickfire Pro broke (the lights just stopped working) after ~8 months of use. Currently I have the option to buy the Quickfire Stealth in Brown switches even though I've already had bad experience with them or the Ducky Pro in Blue switches which I have heard much more about the build quality of a Ducky Pro than the Quickfire Stealth. Right now I'm leaning towards the Ducky. Also, I wish a CMStorm rep could answer this, what exactly is the difference between the Stealth and the Rapid? So ya, QFS or Ducky Pro?
Technically, Quick Fire Stealth is very different with Quick Fire Pro.
Quick Fire Stealth is made in Taiwan by Costa.
IMO, Quick Fire Stealth and Duck Pro have similar quality, construction and keyboard feeling.
There is one obvious different, it is about the stabilizer (QFS uses Costa and Ducky uses Cherry)
Other than that, I think both keyboards are rock and solid.