Is the second screen worth it over a normal Zenbook?

If you constantly juggle windows, yes: the second full OLED panel adds real workspace without an external monitor. If you mostly write or browse, a single-screen ultrabook is lighter and lasts longer.

How does it compare with the Lenovo Yoga Book 9i?

Both are dual-screen convertibles. The Zenbook Duo adds a built-in kickstand and a wireless keyboard that recharges itself, while the Yoga Book relies on a folding stand and a Bluetooth keyboard. Battery life is limited on both.

Does the keyboard work detached?

Yes. The keyboard is wireless and pairs over Bluetooth, so you can use it away from the screens. It charges separately and snaps back for travel.

Can I use a stylus on the screens?

Both panels are touchscreens and support active pens, so you can sketch or annotate on either display. A pen is not always included, so check the box contents.

Expect the laptop, the detachable keyboard, the power adapter and paperwork. A stylus and sleeve are not guaranteed, so confirm before buying.

Is 16GB RAM and 1TB enough?

For multitasking, coding and creative work, 16GB is adequate and the 1TB SSD leaves room for large files. Heavy video or 3D work would benefit from more memory.