as INASNT said it takes a lot to tune an ECU properly....
my friends sr20 bluebird had the motec ecu, and the car was dynoed a few times over a month period, got feeback from the driver, under different driving conditions to fine tune all aspects.
The final product was very impressive.
I do not mean to offend anyone, and it is just my opinion, after many many months of research and trials of different ECU's later, that i beleive autronic is better than the rest.
Downside is that it is not a cheap unit, and it takes many many hours on the dyno, which is not cheap, to fine tune.
And on top of all that only one guy who can tune it properly in melb.