Soy-based toner cartridges?

Jon.Laslow writes: I'm receiving a lot of pressure from managers to switch to soy-based toner cartridges for our laser printers because they are 'greener'. The problem is the only information I can find on them is from sales pitches, and the reviews all seem to be user testimonials, such as these. Have any Slashdotters used soy-based printing products? Did have any issues with them, and what was the print quality like?