We've been very happy with our PRO 780 - no showstopper issues since it was deployed Mid-Feb (we use it 2-5+ times per week) ... we don't cook a lot of fatty proteins (primarily lean meats), but when we do cook Pork or Burgers, we make sure to look for any grease that may have not made it down the drip tray as expected and clean it up ... we also spend most of our time grilling/smoking between 170-350 degrees ... we will go up to 435-450 to finish off burgers ... haven't started trying to do any reverse sears at 500 degrees as of yet ...
Get into a maintenance routine based on the type(s) of grilling you are doing ...
As far as initial setup issues - it seems that a lot of grills are being unboxed with an excess amount of oils, so I would strongly suggest wiping down everything with some paper towels before doing the initial seasoning/burn-in ... following a more gradual temp step-up for the burn-in is something else to consider ...
Lastly, WiFIRE is great when it works ... a vast majority of Traeger Owner's are able to get it working with little-to-no issue ... then there is a certain percentage of those who are having issues where they don't understand the technical tweaks that may be necessary to get the initial setup/pairing completed ... then there is a very small percentage who received a WiFIRE Controller that is either susceptible to Firmware corruption, or has old(er) versions of Firmware installed that simply will not work - when this happens, a replacement controller is needed ...
Lots of people willing to assist on this forum, and considering the SNR is a lot lower than you'll find on the various Traeger-related FB Groups, you should be able to get the assistance/direction you require (if needed) ...