I think you got a bad batch. What are the serial numbers for both QFR's?

No need to disclose the whole thing, just the part starting with SG and the subsequent 6 characters

is urs the black colour one? if yes, let go to me cheap cheap once u got bored. would like to try odd size MKB for the wow factor. lol
i use F keys for dota n TKL not so wow to show off to friends. 

any otai-otai know is this a mechanical switch ? the sound it makes sounds like mechanical

Looks like a Matias ALPS

SGK-4040-GKxxx is the current unit I have. Don't have that of the earlier unit that was exchanged.

Will keep you in mind when I do 

any otai-otai know is this a mechanical switch ? the sound it makes sounds like mechanical

My bad, I meant the part starting with 'US'.

Not SG.

US114370

You got the bad batch from 2014.

Make sure the next one you get has a US115 serial.

*Source:
1 - Here
2 - My own experience after owning 4x QFRi of various switches (not counting the 1x I gave to girlfriend)

Acer Switch.
A somewhat hybrid switch.
https://deskthority.net/wiki/Acer_switch
More info at here

Shyt.. my MKB starts to suffer double-click issue... Press once = twice..

-  What is key chattering/bouncing?
Key "chattering" or "contact bouncing" is a natural occurrence in mechanical switches that can cause one switch press to be detected as multiple presses. Under normal switch operation the digital electronics in a keyboard will filter out a small amount of natural chatter/bounce, however, in the case that an individual switch is damaged or defective, the amount of chatter/bounce can become too large to be filtered. The result is a repetition of key input seen on your computer screen for only one intended key press. This is a problem that affects only the broken switch and is a problem that is covered by your EliteKeyboards warranty.

How to test for chattering:

Severe chattering is actually very rare, but it can be very frustrating if you think the problem is you when it is actually the key switch.

If you're under a Windows operating system, we offer our own testing program Switch Hitter for extensive chatter testing. Testing under other operating systems can be achieved using the following procedure:

1. Start by opening up a text editor like Notepad in MS Windows.

2. Repeatedly press and depress the suspect key and alternate each keypress with a space. It is a good idea to vary the force with which you hit the key in question while performing this test; as chattering can sometimes show up more frequently with hard key presses, but not with light; and visa-verse.

A good switch will have output like this on your screen:

d d d d d d d d d d d d d d d d d d d d d d d d d d d

A chattering switch will output:

d d d d dd d d d dd d d d d ddd d d d d d dd ddd d d

3. Repeat step #2 for several lines and also test a few keys you do not suspect as a control case in order to eliminate your brain and fingers from the equation.

How to fix chattering:

Please, under no circumstances should compressed air be blown into a mechanical switch!! This bad advice is repeated across internet forums, and it is a recipe for disaster. Please do not do this!

If you find you are experiencing a problem with one or more switches, please contact support@elitekeyboards.com.

Noted. Btw, can I be your GF?

Haiz....have to send my QFR-i in for RMA again, LED mati kudasai again. Temporarily using my newly acquired KBT Race 2 MX Blue.
[attachmentid=6416134][attachmentid=6416135]

How long usually does the whole RMA process take?