I have used as far back as 15 years ago, have a back up one that is 5 years old (?), privately a X1 Extreme Gen 2 and a company L13. No significant difference in keyboards, all of those are, or were, great. Especially compared to HP or Dell. Not to speak about Asus...
I agree; the keyboards are fine. I do dislike the layout changes they've made compared to the "classic" keyboards, but it's still better than most layouts out there (and they fixed some design mistakes in the first iterations of it).
