The folding is the dangerous part, which is why the manual says not to try it until you understand it.

Do not fold anything until both halves are on and you understand the mechanism

This is STIGA’s own instruction and it is written in capitals for a reason. A table with one half fitted is unbalanced, and folding a large hinged panel upright before the structure is complete is how people get hurt and how tables get damaged. Finish the whole assembly, read the operating instructions properly, and then try the fold deliberately with both people present. Their manuals also warn against leaving the table standing partially opened and unattended, which is exactly the state it ends up in when somebody is interrupted halfway through.

Lock the casters, including in playback position

One STIGA manual repeats this five times in capitals on a single page, which tells you how often it goes wrong. The casters stay locked at all times except when you are deliberately moving the table, and that includes while the table is being used in playback position with one half upright for solo practice. A raised half sitting on a free-rolling caster can move under its own weight or under the push of a ball, and the person standing next to it is the one who finds out.

Assemble loose, tighten last, and do not over-tighten the mechanism

Their instructions have you leave locknuts slightly loose until you are told to tighten them, which is standard on a large frame that needs to square itself up. What is less obvious is that some fasteners are meant to stay loose permanently. The nut on the safety unit must not be over-tightened, because the red part has to move freely, and another is called out specifically so the table still folds easily. On this product over-tightening does not merely risk cracking something, it can disable the safety mechanism you are relying on.

Latches opposite each other, hinges all locked

Two small details that carry the load. The safety latches must be installed opposite each other on both sides of the assembly rather than in whatever orientation seems convenient. And when the table is opened for play, both leg hinges lock and all four center hinges lock. A center hinge that has not clicked home leaves a table that looks flat and is not properly braced, which shows up as a wobble mid-rally rather than at assembly.

Check whether your model has adjustable feet before you buy for a basement

Not all of these tables have levelers. On at least one STIGA model the four corner legs are not adjustable at all, and the practical consequence is stated plainly: on an uneven floor, that table may not be suitable for the location. Basements and garages are precisely where these end up and precisely where floors slope. If the room is not flat, check for adjustable feet on the specific model before ordering, because it is not something you can add later.

Humidity is what actually kills the playing surface

STIGA warns that moisture and condensation will damage the playing surface and that the table should be stored in a dry indoor place. This is the failure that creeps up rather than announcing itself: a table kept in an unheated garage or a damp basement swells and warps at the surface, and no amount of care with the mechanism compensates. If the only available room is damp, that is worth solving before the table arrives, or worth buying an outdoor-rated table instead.

Know who is allowed to fold it, and check the net spec if you care

Their manuals state that small children, or children not properly instructed in its use, must not be allowed to open or close the table, and that improper handling can cause serious injury or damage. Worth saying out loud to the household rather than leaving in the paperwork. Separately, if competitive play matters to you, note that ITTF specify a net six feet long and six inches high, and some recreational tables ship a shorter net that is perfectly good for family games but not tournament legal. A correct net is an easy separate purchase.