Love that Ergo 4000!
Out of curiosity did you use the 4000 before and how do you find it?
I had a mechanical keyboard for a while after the AWK, but my hands did hurt after long programming sessions. So i gave the Sculpt a go.
It took me a while to get used to it, since it's also wider than the AWK, but not as wide as the 4000. Since i had to fix my hand-hurting issues, i powered through it and now i'm pretty happy.
So to answer your question: Since i was using an Apple Keyboard for years, the click-clacky laptop-style keys were not in issue for me. :)