The FS is generally quieter although some have had positive results w/ changing the tubes on the Aesthetix. I recently did a comparison of my FS pres del-2 against the Calypso and besides the FS being quieter and perhaps slightly more detailed, I did not find the calypso to warm things up alot, although it did portray images as slightly rounder. I did not hear anything that made me want to change to the aesthetix.
