I had a cheap miller auto darkening helmet with the small view glass. It works OK when charged but you cannot change batteries in it, it is solar only and is non-adjustable. I have to stick it out in the sun for a little while for it to work right. I think it was $89 or so when I bought it.
I recently bought a nicer Forney with the large view glass, fully adjustable, has replaceable batteries, has cut and weld settings although I have shade 5 glasses for that. This one cost me $135.00 with a coupon for $10 off. It is MUCH better than the other one in all aspects. You can see much more clearly with it, it always works, when the time comes that it doesn't at least I can change the batteries and it has spare clear lenses that came with it.