I've been thru a few different hoods and have been served well by the Harbor Freight units with either the silver or blue blaze decals. My blue one is about 9 years old and the silver one is about 4 years old They have only 2 sensors so, you need to keep your face square to the welding. At least 2 sensors are needed for the unit to function. This is how all 2 sensor units work. Anyhow, the HF hoods are good, functional and high-value. After a decade, the strap mechanisms are working fine. I replace the sweatband with generic replacements at least 1-2 times a year.
The front clear lens (0.040" thick polycarbonate plastic) is what blocks all the UV. Never weld without that in place! I buy it in sheets and cut it to size with a box cutter for a replacement cost of about 10 cents per lens. Just look on Amazon for polycarbonate sheet plastic. Polcarbonate is very easily scratched and it absorbs chemicals very easily. After a week of welding, you can see that it's permanently yellowed/discolored. If you want to see what you're doing (especially the weld puddle) replace that lens frequently. Clean the inside lens too. After a few hours, it's filthy with soot.
If you do a google search of the serial number on the auto-darkening control unit, you will see that they are the same ones used in a lot of the "name brand" helmets costing hundreds more. Alibaba sells those control units in minimum lots of 5000.
If I buy another helmet, it will be one of the "color view" or "clear view" units which hit the markets a couple years ago. My buddy let me try his last year and it did have better color rendition and fewer contrast problems. But not enough for me to justify $250 more because my $50 helmets serve me perfectly. I'm waiting for the price to drop on the Lincoln Viking.
Happy welding...
Ray