A sway bar is a simple device that rarely causes any problems once it's been correctly installed. I put the Hellwig rear bar on my 19 Raptor about a week ago and it definitely improves handling in corners and on curves. I read another post about a similar install and the OP mentioned that he originally put the end links in the outer most hole in the bar and then moved them to the center hole for better handling. I did exactly the same thing - the center hole in the bar end seems to be the sweet spot for improved handling without harming ride quality. I don't anticipate being off road with this truck so the bar only enhances it's road manners - I don't see a downside to it.
The Raptor bar install is exactly the same as a regular F-150 install, so there are plenty of videos and similar posts on the F-150 forums to refer to. Once installed, you should be good to go for at least 100K miles without problems or maintenance to be done.