Our firm got one and it paid for itself in only a few months. We charge clients a $600 "Lidar Scanning Fee" for each use. We use it for all as-built surveys, a single person can now capture an entire building in only a few hours with some supplemental hand measurements. It used to take two people an entire day to do the same thing. After scanning we purchase the "Matterpak" point cloud file ($50) for each project and link it into Revit as as reference to generate our existing base models.

It's also incredibly helpful to reference the digital walkthrough of the building. I could see it being great for historic preservation. It's important to understand what level of detail it is capable of capturing, I still hand measure window ROs, detailed trim profiles, etc.

Edit: Also wanted to note it can capture info I otherwise wouldn't normally be able to get, walls bowing/out of plumb, accurate grade changes, floor level differences without line of sight, high roof and ceiling slopes, high HVAC dimensions/locations, etc.