I have the Merc Stealth also and love it.
The only problem is, Break a Key, and then try to get a replacement.
I Did, emailed and called them, and they Would Not Sell Me A Replacement Key!!!!!!!!!!!!!!
They said "It's counterproductive to our business to sell replacement keys to the community"....
I Then Told Them, "First Time Owning Your Products.... Last Time Owning Your Products!!!!!"
Thanks for nothing....
BTW no other company carries keys for it.
I wound up taking a key out of another socket cutting and reshaping to replace my broken Down Arrow Key.
So when it breaks for good, my keyboard will be replaced by another Company that is not run by SHITBAGS!