Consider the specific performance gains you're looking for, such as increased horsepower or improved throttle response. Look for intake accessories that are designed to provide those specific gains. For example, throttle body mods are more important for those wanting better throttle response while intake manifold covers are better off for more power.
Look for high-quality components made from durable materials. Avoid purchasing low-quality parts, as they may wear out quickly or not perform as expected. Generally, high-quality materials such as stainless steel, carbon fiber, aluminum, silicone, and polyethylene are durable, heat-resistant, and lightweight, all of which are perfect for intake accessories.
The intake accessory you choose should be compatible with your vehicle's make, model, and year, but also with all the other intake system mods you did and preferably with all of your software mods and other linked powertrain mods. If you manage to strike a nice balance between all of these, you will gain more horsepower and better throttle response without hampering reliability.
Overall, intake accessory modifications can be worth it if you're looking to improve engine performance and throttle response. Everything depends on the cost, compatibility, warranty implications, quality, and legal considerations. If you do your due diligence and install all the mods adequately, intake accessory mods are indeed worth it.