Quoting 3rdstrikedsm:
Yes it is complete garbage when compared to other options out there even megasquirt is better that AEM but AEM has better marketing so everyone thinks it is better and trust me it is not!
What? How is AEM "garbage". You haven't even explained why but rather just shouting your opinion randomly.
In essence, for the majority of what people will use, anything that is a standalone will suffice. What separates them is their advanced features and user interface.
What makes me qualified to make this decision? I have owned a Motec M4 Pro, Motec M8 Pro, Haltech E6X, Microtech LT8, AEM EMS and Megasquirt. I tuned and set everything up. I never owned Vipec or Pro-EFI but have seen both and are pretty good. Also there are many things that people "claim" aren't capable when in fact they are if you know how to program it. That and everyone like to compare the AEM V1 which is VERY old to the newest ECUs that are coming out.
Here is a good example of why AEM and Pro-EFI can be considered above the rest. In supras, they are the only ECUs that can control the automatic transmission.
Here is a good example of why Motec can be considered above the rest. They offer some of the best telemetry available in the race world.
Now lets be 100% realistic here. If you are normal dude, you are going to need a tuner to do everything for you. Hence 80% of those fancy features, you wouldn't even use because it would require a crapload of tweaking that a normal tuner won't do unless you are willing to pay him for his time. If you an advanced tuner, more than likely you will shade towards an ECU that you are comfortable with and have learned their software.