Alright here is my ?

What is the difference between the S-200 w/datalogging and the S-300.
I know on the S-300 you can adjust while driving.
The s-200 you can't right.
On the s-200 you have to reburn the chip when you wanna change it right?
I'm just all confused on this subject.
I really dont wanna spend 600 for a s300 but if it is worth it then I will.
Any help would be apprecieated.
Thanks.

Cody