I have some Sigg bottles. Some of them are a couple of years old. They held up really fine to not so delicated treating (I cleaned them with hot water and baking soda and they have a coupole of dents). Recently Sigg seem to have adjusted their qualitiy though. Some newer bottle suffered from corrossion right in the middle of the bottom (with transparent paint you can see the center of a pattern from manufacturing there). It took an average of 1 1/2 years until the bottle leaked because of that. The newer bottles were not treated as rough as the old ones. I think that the bottles are overpriced and overrated.