What are the pros and cons of auto darkening welding helmets?

Pros of auto-darkening welding helmets:

1. Provide excellent head and face welding protection.
2. Have an electronic filter lens that instantaneously darkens and lightens automatically.
3. Have a liquid crystal display (LCD) with adjustable features allowing you to set the shade level (typically shades 9-13) and sensitivity of the filter.
4. Have a passive lens shade of #3 or #4, so you can easily inspect your work without lifting the mask.

Cons of auto-darkening welding helmets:

1. The initial cost is more than standard passive welding helmets.
2. Requires batteries.
3. Replacement parts are more expensive.