When you need them, they're awesome, especially the coverage onto the shoulder of the road.
The next thing we need is some empirical fuel economy testing. I am still really considering a Ford turbo, and if the FiST has *really good* gas mileage I would forget all about the FoST.
Edit: Feedback on the nighttime interior was helpful - that was my biggest complaint about the FoST - the disco light interior was really distracting. I didn't notice anything like that in the rental Fiestas I had, so I'm happy to hear they didn't add anything to the ST.