Well heres my take on it. EFI is the best thing to happen to the automobile since the rubber tire, being a master tech and specializing in emissions & drivabilty problems I haven't had to spend half my time adjusting chokes at every season change, I haven't had to run service calls on ice cold mornings too pull spark plugs and burn em off in driveways so the frantic owner can get to work so they don't loose their job. etc.etc.etc.... I love the OBDII systems(96 up) and ain't nothing cooler to me than fixin the one thats been to 10 different shops. As little as 15 years ago it was very rare to see a vehicle go to 100,000 miles, but nowdays it's common place to see 200,000 or more
and I can only contribute that to the EEC systems. Now about the aftermarket systems, I gotta admit I don't know much about em,I know Holley had one they discontinued because it had problems but the problems probally stemmed from the users not having enough knowledge to set em up & maintain em properly.But let me say this,if I built another rod with a closed engine bay it would for sure have an OEM type of EEC system.As of now my little coupe is running a 3 duece rochester setup cuzz thats the look I was after,I really wanted to go with Moons new 3 duece injection setup and was pretty impressed with it, but being the cheap S.O.B. I am,just couldn't justify the cost,specially when I think I can build the same sorta set up myself,but that'll hafta wait for the time being.....