Well, this is a fabulous little gem. I absolutely love it! I downloaded it, because one never knows when a key will malfunction. It is better to have it and not need it, than to need it and not have it.
The way one can shrink the size to almost nothing, or drop it into the dock, is marvelous. The option to have it be silent, or clicking like a typewriter is also really cool.
It even becomes transparent until you hover over it. Of the 3 available color options, I prefer the irradiated one. I"m sure I will use all the colors, because I change my desktop a lot.
I know one thing, it is a lot less painful on my wrists, to type with KeyUp via mouse than actual typing. I'm even using it to write this review. The only drawback is that I keep forgetting to shift back to lower case. I'll get the hang of it though. It is a splendid utility app. Thank you.