Way to boost the post count unknown240. We value your feedback!
I've used the E8. It connects via a DB9 Serial cable. I've looked into it and the biggest upgrade for the Platinum is more sequential outputs and better support for modern engine features like VTC. The new software is supposed to be pretty slick, too.
Honestly, I'd look into getting a used Power-FC D-Jetro for cheaper than either of them. Add FC-Edit if you want to use a laptop instead of the Commander. It's a lot more straight forward than a Haltech, and it's specific to the SR so you don't have dumb setup issues.