I've had 5 bad iOne made keyboards.
2x DEFECTIVE Black Widow regulars, sticky space bar and S key, VERY Un-smooth actuation of top row of keys, the keycaps were cut poorly such that the plastic spurs rubbed against the outer casing and other keys in between.
1x DEFECTIVE Black Widow Ultimate, Just **** all around, same problem as above, AND 1 of the LED under my "K" key went out after only 1 week of use.
Now the 4th board, i'm not sure is made by iOne, but I had the K60, and then the K90, basically both these boards had a severe problem with keys sticking, NOT literally like on the black widows, but when you let go of a key, the keyboard still think the key is depressed.
This is a major documented issue that Corsair tried to bury on their forum, and taking every roundabout to the issue.
Looking at the key spacing of the bottom row, the K60, K90 may have been made by iONE, which is why their so ****ty and completely un-usuable.
So I called up corsair, and they replaced my k60 with a K90, but guess what, SAME freaking problem with key sticking.
Long story short, anything iONE can diaf