First impressions are.....wow!! Did some data logging this weekend so looking forward to refining the tune even more, but I think the most noticeable difference so far (over the JB4, in my case) is the truck just runs BETTER. I can't think of any reason I would recommend the JB4 on a raptor compared to an ECU tune, and I was able to put about 9,000kms on it before I switched to the Cobb stuff. Truck runs better in normal conditions, in no boost to low boost to high boost. I am actually very rarely on the throttle in a full boost setting, so as a daily driver its just nice to be able to get full advantage of what this engine can do, its very snappy and responsible with this tune so for everyday driving with traffic its nice to be able to get where you need to go and not have to wait for the turbos to wake up. I feel like the factory tune is so sluggish, the JB4 makes it less sluggish but you can tell its still not totally there. I would highly recommend trying out the cobb accessport, and even moreso recommend GooseTuned!