The only issue I had was a tiny ding on the inside of the driver's door. I didn't follow up with the dealer about it because it doesn't really bother me.
I did a road trip from West TN to Dallas right after the install so I don't have an accurate report on day to day fuel economy yet, but the ride and handling difference is negligible. If anything it may have just a bit smoother ride.
I just had the Ford Ranger Lifts 1" level installed on my Tremor and wanted to add another pic for those considering the kit. There's still a slight rake (about an inch) but I think it looks perfect!