I believe most with tunes will say all Pros and little to no Cons. Best to do some research on the forum regarding tunes and tuners that will fit your needs. I went with Gearhead
https://www.ghtuning.com/ for both my 2020 F-150 and the 21 ST. I went with GH because of my research and what I was looking for. I wanted a tune that offered more power but maintained great drivability. These guys actually own the vehicles they tune and since they drive them daily understand what your looking for when you explain what you are looking for in a tune. My tune for the ST in not to eek every ounce of HP out of it but to gain power/torque where it can best be used and maintain good driving characteristics.
As for warranty, again do some research but law pretty much states that the manufacture would have to prove the tune directly caused the issue to void your warranty.