They are very good, but there are also a bunch of different models that are very similar but are not the same. So you might want to do some reaseach on what your needs are and thus which type of fans you need.

This ranges from ones that have different speeds and different noise levels, all the way to fans that are designed for airflow(ex: normal case fans) and ones that are designed for air pressure(ex: blowing through a radiator). And they can be noticably different if used for the wrong thing.

Also check which fans are making the most noise. For example the case fans might mostly be fine and swapping the CPU cooling fan(s) could fix it.

Although it's important to note that GPU fan will pretty much always be loud under load unless you go water cooled. And even then you'll hear it when things heat up.