Honestly, buy one used on eBay, give it a spin, sell it again if not happy. Things that worked: Scanning a trackball I own, create a snug fitting cover for the backpack. Scanning the charging port of my Audi, create an inset for snowy weather. Scan an ITX Mainboard and a PCIe card in it, create a frame that holds both and a fan. What did not work: Scan a small plastic cap with threads and all and replicate it. Anything that has deep grooves, holes, you name it. If it disappears within a 30° angle from a distance of 20cm, you’re likely not scanning it. Shiny surfaces need to be matted, either with isopropanol and talcum or some kindof special, sublimating scan spray. I usually use the thing for freeform stuff that is too aggravating to measure, but still measure dimensions that need to be exact. Yes, the software puts out a mesh of polygons in formats like STL. I usually load those into CAD and model around it.

Got mine, an Einstar Gen1 for about 1000€ two years ago. They are cheaper now, new.

Ever used one of them handheld 3D scanners that create huge point clouds and derive a mesh from them? Yeah, I regularly hit the ceiling at 64GB with bigger scans at high resolution.