Name the problem clearly
Describe what you want the product to improve in one sentence. Connecting an existing monitor or keeping charging cables within reach is easier to evaluate than upgrading your workspace. If you cannot name a repeated problem, wait. Check whether rearranging the desk or using something you own could solve it.
Define the essential requirements
Write a short list of requirements that would make the purchase useful: dimensions, compatibility, adjustment, or a particular function. Separate these from appealing extras. Check the exact model and version against the list. Treat unclear descriptions as missing information rather than assuming the feature works the way you expect.
Consider the full commitment
Look beyond the initial purchase to batteries, subscriptions, cleaning, storage, and replacement parts. Include any adapters or separate peripherals the accessory requires. Estimate how often you will use it and where it will live. An item is less useful if it creates recurring work or crowds space needed for everyday tasks.
Make the decision reversible where possible
Read the seller's return conditions and the manufacturer's support information before ordering. Compare alternatives using the same requirements, then pause if the purchase is optional. Keep the reason for buying visible. After a few weeks of use, judge whether it solved that original problem, not whether the packaging felt impressive.
A new product should solve a clear problem or add something useful to your day. Check the exact specifications and compatibility before spending.