Nicely backlit, perfect for daily online perusal, but I also own the usb keyboard with 10-key functionality which I use when working remotely. The keys on the external keyboard feel more 'robust' and capable of handling a heavy volume of keystrokes.
The Asus keyboard tends to “miss” my keypresss enough to be very disruptive. The previous laptop I had, what would be a very old MBP if it were still around, also had this issue, though only for a few keys. I played around with the subsequent generation MBP keyboard at an Apple store once, and it seemed fine.
I guess the moral of the story is to try before buying.