I have used soda blasting a few times in the last couple of years, it does a great job of stripping the car back to bare metal with no damage. Rust is exposed and you can deal with it however you want.
A plus is that there is some reaction that stops surface rust for a few weeks.
A big minus is that every bit of the surface will have to be rubbed back, as clean as it may look, as you will find that paint won't stick to the treated area.