for most things, I use my optivisor (super great thing, just get one. just get one!)
I'm also looking for the next level of mag, so a stereo microscope is also on my buy-it list. so I'm following this thread, as well.
both are different. I started using the optivisor about 8 years ago and I won't ever solder anything unless I'm wearing it, now. yeah, safety matters. you get one pair of eyes.
but for tiny smd work, the head mounted ones run out of power. I can spend more than $100, but I don't want to break the bank. what are the levels of prices, so I can figure out how to avoid total junk but also avoid overspending. I'll probably use mine a few times a month, at most.