I was going to say "unless someone has hands on experience and recommends it", so thanks for that info. Some of the Chinese stuff is decent quality and good value.
What do you use it for?
Relaxed head up looking into a 1080p monitor for board inspection, part numbers , reverse engineering that kind of thing. My use pattern and setup is still evolving but is getting close to optimal now. I discovered I stick to two ranges of magnification a high range of maybe 25x with the andonstar looking at solder joints, and a low range of 1.75-2.5x when I have a tool in my hand and need the immediate stereoscopic vision and free head movement of a visor.
I use these Donegan Optisight visors:
https://www.amazon.ca/Donegan-OptiSIGHT-Binocular-Magnifying-Visor/dp/B0006O8RXM/ref=sr_1_3?ie=UTF8&qid=1536888848&sr=8-3&keywords=donegan+optisight Note the plural visor(s). There is a sub-story here. In the past two+ years there has been a real drop-off in the delay and reliability of getting parts from china/ebay/ali to Canada. When they do come it is like 3 months later, and I have had small parts go missing/not shipped, for example I tried to buy cheap STM32f030 twice! The last time in may 25 from gc_supermarket a big ebayer, still haven't arrived. Meanwhile other parts like a used OCXO from RF_buy have come somewhat promptly. I am pretty sure most of the time is spent in Canada customs. Now I don't want to make an ebay complaint if the thing is sitting in customs. I did last year for an LCD display that was way overdue and as I was negotiating with the seller it showed up in my mailbox 4 days later. Very frustrating. If I give the seller the benefit of the doubt then I have to wait months and my complaint eligibility expires. So when I once would have waited for an ultra-cheap knock-off visor from China I said to myself forget it just buy the overpriced Donegan and get it now. So I bought the first one and it came from Seattle in a few days.
Great, except it was missing the additional lenses! It did however have the 2 diopter lens in the frame and after using it for a bit I fell in love. I didn't want to send it back. I suspect someone else bought this item just to steal the extra lenses and then got a refund. I realized I wanted the higher diopter lenses and I wanted a second frame anyway so that I could switch magnifications promptly without putting finger print grease on the lens. The frames come in different colors so I got the second one in a different color and it sat in customs (Richmond BC Canada post facility) for 24 days (sigh)
. At least this time it had all the lenses. I also bought a 7 diopter lens separately. At the time that treasure of acrylic cost more than the complete visor with 3 lenses
. They are cheaper now.
I used to have perfect vision but now have just enough astigmatism to make detailed near vision problematic. It also complicates any magnifier solution. The Donegan frames allow me to wear corrective glasses inside the visor with complete comfort. With the magnifier bale tilted up, so that I am just looking through the glasses I often forget I have it on. I keep a 4 diopter lens in one frame and a 7 diopter in the other. They also allow good peripheral vision so you can see and pick up tools off the bench without having to shift your head. Because you bring the magnifier to the object of interest and not the other way around (as with a stereo microscope) the visors can be used in my garage for metal work scribing lines, aligning punches ect. The one disadvantage of the visors is that the working distance could be bigger, so I have my face closer to the action and fumes than I would like. A fan to push or suck the flux smoke is a necessity.