As a Samsung Galaxy S (Vibrant) buyer there I no way I would touch this phone. Samsung took nearly a year to go from 2.1 to 2.2, and seeing 2.3.4 on the original S line is highly unlikely.

I think Samsung makes some great hardware (I'm typing this on a Galaxy Tab 10.1), but until they start showing more support for existing hardware, I do not plan to purchase anything else from them.