I've had mine for 9 months now and teh bezel is really like new!
Today, I tried to polish the ss bezel of my 140C, which has weird scratched which must have come from running around with the light in my pocket (it's alone in there, always!). I don't know what did the, the G-1000 I suppose, I was not able to polish them out, even with Scotchbright and steelwhool they can still be seen, they look like little dirt splashes.
The 170Cn has been carried around in exactly the same way, nearly as often asd it is still mint like the first day! The only thing I don't like about it is the touch, it feels "rough", not smooth at all. My lights stand on glass and while normal titanium bezels, just as ss or aluminium slide easily, the AlTiN doesn't. The advantage of all that is, that it has the best grip you can imagine, screwing it on and off is piece of cake!