In the case of the Mantis, I would recommend to 'try before you buy' as the Mantis doesn't suit everyone. At work opinions are divided, some people avoid using the Mantis as they get distorted vision when using it. There is an adjustment control on the side of the instrument to counter this effect, but some people still can't use it. Other people really like it.
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I think the Mantis is very bright and sharp and it offers a degree of 3D vision if you move your eyes slightly. It's at its best for SMD inspection work where it truly excels. I'm happy to use one but the view they give isn't as natural as something from a high quality stereo microscope.
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A good stereo microscope can offer a wide view area and if a Barlow lens is fitted to it, the height above the work can be in the order of 120-150mm. This is a good height in my opinion.
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Here at home I use an old Zeiss GSZ stereo microscope. It is a bit tired now and probably needs to have all the optics cleaned inside. However, I think it is much better than a Mantis when it comes to doing soldering work or any kind of intricate work. It has an external KL1500 cold light unit with it which gives very natural lighting.
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The Mantis is best suited for inspection in my opinion with very sharp optics and very clinical lighting and a degree of 3D when you move your eyes.
