I run ICS on my Galaxy S. Right now the only feature not functioning is video recording. Definitely worth the side-grade from my Droid X (which locked the boot-loader). $100 for the S, sold the Droid X for $90.

It looks like TouchWiz deserves most of the blame here — according to Samsung Tomorrow, neither device has enough RAM or ROM to accomodate TouchWiz and all of its Samsung-designed accoutrements without affecting the quality of use.

Ah, the vendor screws up vanilla ICS and blames the device for not having the memory to run these "improvements".