The JLT has a poor MAF signal and it gives driveability issues, especially in automatics, this is a well known fact to most good tuners now. Why do people run it? Because the school of thought that bigger is always better is still alive and wrong.
Completely not true, just bashing other competitors. My maf data is perfect and I have an automatic. Just make sure your filter cone is at the far end of the tube. I know personally of two people who had bad mass air flow data both were easily fixed and dozens with never a problem. Again OP be careful of hype, because the JLT rep on here can be a real piece of work too. Just look at all the 1/4 mile times and the happy customers.