The Sonata is a quiet case with many nice features as otherreviewers have pointed out.I just want to point out that although this case is quiet,it is NOT silent. I can still hear the PSU fan at midnight (Ididn't connect the Antec case fan that come with the case). The CPU fan I have is a Zalman fan running @1330 RPM. The CPU fan is quieter than the Antec PSU fan, so the noise is mainly from the Antec case (I have no other fans in my system). Given that Zalman rates its fan at 20db, I think the Antec's rating of 20.4 dB for its case is not exactly right.Also, be careful if you have more than 2 IDE drivers with regular IDE cables. The layout of the case makes the it impossible for me to connect the CDROM and the third HD drive at the same time: thecable is too short! I guess if you have SATA drivers, it won'tbe a problem.Overall, I would recomment this case. But I give it a 4 starrating due to the two issues above.