"Pete C." fired this volley in news:502fa96a$0$14604
:

For $50 or less with coupon for the HF autos, who cares?

ACtually... there is a concern. Some of the cheaper ones turn off
unexpectedly. If you don't use one often enough to recognize that it's
off, and "re-tap" the glass to turn them back on, you could get a shot of
light you don't expect or want.

If the folks kibbitzing aren't experienced with auto-darkening helmets (I
have one... I meant "set to #12 shade" earlier), then I'd suggest that a
fixed lens is better for safety.

LLoyd