They are awesome, and, well, yes, they are loud. But given most folks who will do that are already set with a room they will use as their server room at home - most do not mind.
Additionally for the cost of 6 bucks or 6 euros or your local currency, you can find ways to mitigate that which aren't that bad.
This is a classic design, as mentioned, and has been proven over 10+ years - probably nearing 20 years now.
I will likely build one very soon (: I have the lacks (:
Personal server for trans moms <3