Firstly, consider how much it would cost to replace your gadget should it be lost, stolen or damaged - is the amount of gadget insurance available high enough to cover the cost of this? Also, take a look to see if there is a maximum claim value per item or not - Alpha's gadget insurance has no single item limit!
Does it cover things such as loss, theft, accidental loss, water and liquid damage? Think about what elements you need your gadget to be covered for and check what is included in the policy.