Is it worth swapping the fans on my AIO cooler?

Unless you're in a compact PC where every degree counts, it's often not worth the hassle to swap fans. The performance gains are usually minimal, so consider whether you really need to change them out.

You should think about why you want to swap them. The temperature differences won't be huge unless you're focusing on aesthetics. I switched my stock fans for something different, and as long as they have good airflow, you should be fine.

I've always used Noctua fans in my AIO builds. Realistically, performance won't differ much, but it’s a good idea if you're seeking quieter operation or better aesthetics, just don't expect huge changes in cooling efficiency.

Swapping fans usually doesn't lead to significant performance improvements. As long as the fan is properly mounted, you'll get decent cooling, but faster fans bring diminishing returns and won't drastically change temps.

It's pretty easy to swap them, but the actual gains in cooling performance will be minor. If your goal is aesthetics, go for it, just keep in mind the performance might not improve significantly.