That one's not bad.
It takes some persistence to learn, though, but it's not quite as hard as learning a Dvorak keyboard. Most other chording keyboards have reputations for taking a long time to learn. Yes, I have one. It's also a big head-shift to switch away from keyboard shortcuts and use the mouse more.
But the main problem is that the timeout for chording is a bit long, which means it produces some unique typos (if you type E Space too fast, you get Z because Z is E+Space). The other catch is that the main layout is for a right-hand... but what about mousing? That's why I bought a left-handed one: then my right hand stays on the mouse.
Wade.
Q:Is it proper to eat cheeseburgers with your fingers?
A:No, the fingers should be eaten separately.