Looks sexy, but works ... not so well. The smoke tint attenuates the light by an average of 50 to 60%, resulting in the taillights, and worse the brake lights, that are practically invisible during the day. For a time they were popular on cars in L.A., but there were lots of rear end collisions due to the dim brake lights and most accessory shops stopped selling them.
I somewhat agree...
On a visibility scale of 1 to 10:
Stock bulbs with red lens = 5
Stock bulbs with smoke lens = 4.5
Clear alternatives integrated with stock lens = 3 (I'm factoring in the terrible signal integration and how hard they are to see)
Clear alternatives integrated with smoke lens = 2 - 2.5
CustomLED integrated with stock lens = 10
CustomLED integrated with smoke lens = 10. Yes, they are just that damn bright.
I'm already 100% more visible than ANY stock configuration, swapping to the smoke lens made no change that I could tell, and yes, people notice more, as I can see them braking much sooner than they used to. I can live with a loss of a few lumens as I'm already head and shoulders above stock configuration.
I would agree, though, a smoke lens on something like a clear alternatives would be dangerous. Those suckers just aren't bright enough.