Getting your first kit running solves one problem: a working setup, assembled by hand, no electrician involved. The question that comes after is different. Once the base is in place, what's actually worth adding?
We looked at what customers who already own a kit buy next, and three modules come up again and again.
The Outlet Module O1-2 is the most common add-on by a wide margin. It's a straightforward answer to the most common complaint about any power strip: not enough sockets in the right place. Add one behind the desk, one behind the TV console, one wherever the original kit's four sockets ran out. It clicks onto the same system β no new tools, no new wiring.
The USB-C Module F2 solves a narrower but sharper problem: a socket full of chunky phone and laptop chargers. At 30W, it charges most phones and small laptops directly, freeing up a full-size socket for something that actually needs one. If your desk or bedside table looks like a charger graveyard, this is usually the fix.
The Smart Matter Control Module F1 is the one that changes how the system behaves, not just what it can plug in. It brings scheduling, remote control and Matter-based automation into a setup that was, until then, just sockets. Customers who add this one tend to have lived with the basic kit for a while and know exactly which socket they want to schedule β the reading lamp, the coffee machine, the thing that's always left on by accident.
None of these are upgrades in the sense of replacing anything. That's the actual point of a modular system: the kit you started with keeps doing what it always did, and each addition solves one specific problem without asking you to reconsider the rest. A Power Cord Px extends reach if the run needs to go further; an Outlet Module adds capacity; the Control Module adds intelligence. You're not rebuilding β you're adding one piece that does one job.
If you're trying to decide which one first, the honest answer is: whichever problem you actually have right now. More sockets, fewer chargers cluttering the desk, or a plug you'd like to control from your phone. All three sit at roughly the same price as a single component purchase, and all three snap into a kit you already own without touching anything else.
If you haven't started yet, the Start Kit Smart Schuko is the natural base to build from β everything above assumes you're starting there.