I'm just an amateur at this whole wood pellet grill/smoker still, but from what I understand is, reverse searing is used when you want to get smoke into the meat for awhile till you reach a certain temperature, then when done smoking, you sear the meat at a high temperature to finish.
I did this with the burgers, and they were really good. Instead of smoking at 225 for an hour though, I think I could have taken them off the grill after 45 minutes, then seared. I like a little bit of pink in my burgers, not too much though.
If you read the owners manual, it suggests if you want your setpoint temperature at 225 or whatever, you should set the temp higher and let it get to that point, then bring the temp back down by setting the temp at what you wanted, and open the lid to help it come back down to the temp you want. I had my cheese smoking, and the ribs, and the temperature never left 225 for over 5 hours during the process of the ribs once I got it to 225.