Click on my sig file link and read up on the TBI pages. FSJ specific information and general info links are provided.
Short version: I have a modified turnkey system that now has spark (timing) control. Everything works like GM intended it to except I don't use a knock sensor.
MS is definitely getting more support now, but it DEFINITELY is not a plug n play type of system. But if you really want to play with it, it will do things the GM TBI engineers never even dreamed of!
If I had time, I'd look into a MS system. But I'd rather be