I have the Megasquirt and other than being able to control every single thing that my car can do, I don't see the need for it. Unless you are racing all the time you don't need it. Too much can go wrong. I would stick with what you have.

As for KA's. They are cool in their own way. In my opinion though they feel clunky. They don't feel as smooth as the SR. They are more expensive to build than an SR as well. I would swap to an SR soon as you get the chance.