Excluding inspection (AFAIK that's what Tagarno was developed for), in my experience any other job like soldering, PCB repair and similar tasks, require stereo vision to coordinate your hands and tools.
Just to try how could be the 2D vision, I've used only one eye on my stereo microscope during solder work: I could not distinguish the distance between the solder tip and the PCB.
Even with high frame rate option, isn't a USB microscope worst than a classic optical stereo microscope? In other words, suppose I can afford a Tagarno HD, wouldn't I work better with an optical stereo microscope like the Mantis?