[Panelfantastic]

I could be waay off about Megasquirt... but the way I understand the product, it is a basic unit that allows you to develop your own fuel mapping from their base program. Ideal for tech savvy guys who want to spend hours mapping every micron of their fuel curve and trying to optimize power and driveability.
I bought a harness and ECU that is already programmed (not Mega) because I'm not really interested in learning fuel curve data logging. I like nuts and bolts, hands on tools, that kind of stuff. I don't have the patience to sit in the passenger seat for hours and ride around trying to develop a fuel map. G*d bless those that do! it's just not for me. I want plug and play.

If you can use the stock brain and harness, hell yeah that is the way to go! Most stock units have sooo much extra garbage that you won't be able to use but still need inputs and the average Joe doesn't know how to sort them out... they end up going with a Mega unit and starting from scratch. Plus, comparatively speaking, Mega is inexpensive (almost half what I paid for a Delphi for my Eco).