Just as simple to set up as the Extreme if you're on iOS, and even simpler on Android.
I placed it in the same spot where the Extreme was formerly located; my signal strength at the other end of the apartment and outside is noticeably stronger, perhaps due to the multi-directional antenna.
I've been dogfooding the device for about 4 months now. Before, I was using the previous generation Airport Extreme. It is far better - the app makes it super simple to set up, the signal seems to be stronger throughout my apartment, and I love having a convenient way to monitor / admin it remotely (via the app). Well worth the price imo.
I placed it in the same spot where the Extreme was formerly located; my signal strength at the other end of the apartment and outside is noticeably stronger, perhaps due to the multi-directional antenna.