Before buying a stereoscopic microscope I would first check whether you have stereo vision and how much of it.
Based on everyone recommending them for soldering, I bought a trinocular microscope with camera a few months ago, and I've come to the conclusion that it's easier and much more comfortable for me to solder using the camera and a monitor than the optical system.
I thought I had discovered that I was stereo-blind, but that's not the case, I have better depth perception with a stereo image, but just a little bit better, definitely not night and day.
I've come to the conclusion that although I have stereo vision, it's probably not a lot of it, and my brain also relies on other visual cues to determine depth, so the difference between stereo and mono is not that dramatic.
The problem I have with the optical microscope is that I have to set it up just right and be very still while looking through the eyepieces, moving half a millimeter will make me loose the image partially, or totally, in one or both oculars. This gets a bit tiring, sometimes I am more focused in keeping my neck/eyes perfectly aligned than in the actual soldering.
The quality of the optical image is of course very nice, and as I said, depth perception is a little bit better for me. But since I'm perfectly capable of soldering while looking at a display, and the ergonomics and working distance is better, I think that's what I'll use.
YMMV