Have to agree, the slims are considerably quieter and better at staying cool at lower fan settings (as you would expect). This chip die size is really what the ps3 should have debuted at, imo. They (and probably X360, alike) overextended a bit this generation on what technology could provide at the time of their introductions (considering apparent console lifespan and reliability issues).
On the slim I am using, the fan still gets to breathing hard after some game play, but not huffing and puffing nearly as hard or as loud as the original. The slim doesn't compare, however, when it comes to elegance of construction of the original. The slim just seems like a cheap plastic appliance in comparison with its dull, textured surface, membrane buttons, and loud/unmuffled optical drive.
I need your sweet love, Rosetta Stone girl!