Start with the manufacturer's included coverage and any protection already provided by the seller or payment method. Then read what the extended plan actually covers, excludes, and requires: deductibles, repair process, replacement limits, and cancellation rules.
Compare the plan's full cost with the item's replacement cost and your ability to absorb a repair. Product reliability and expected ownership period matter more than a scary sales pitch. An offer can be worthwhile in some circumstances, but a cheaper future replacement or narrow exclusions may make it poor value.
Decide from the written terms and your risk tolerance, not a checkout timer.