I recently acquired a Louisiana Grills LG800-Elite from Costco when it was $499. I can say it has no issues searing in its flame zone. The controller goes to 600F, and it most certainly can reach that while consuming many pellets in the process. At 500F+, you have flames coming through the main level grate.
My experience thus far is that if set up for optimal grilling, the controller programming is such that maintaining stable low temps below 240 is difficult. If set up to have stable low temps, then reaching higher temps quickly, or recovery from opening the door and such, will be hampered; it does it successfully albeit slowly. There's probably a happy medium to be found, but I've not yet found it myself.
The programming from the factory did not match anything LG has published or suggested publicly for people to use, but that programming made it a grilling machine. It overshot all temperatures, would not maintain low temperatures, but it was crazy fast to get hot and recover from opening the door. I'm currently running one of their suggested programming modifications, which helps in the low temps, but as stated above, hampers the speed to change from low to high temps, or recovery when opening the door. I intend to keep tuning it to meet my preferences, and I feel confident this can be done, but they are not up front about what each parameter in the programming actually does.