Bought most of mine 15 years ago, though some was around 10 years ago when I saw how well it was wearing. I must admit that I do not dishwasher them mainly because they are so easy to clean, but also because they would fill up the dishwasher! I have also bought them for other family members.
Mine mostly look close to new ie no damage to the nonstick circles, though they can stain on the underside / round the rivets joining the pan to handle.
I have the full set you mention plus a roaster, stir fry pan & frying pan. I have enough space in my old fashioned kitchen shelves to nest one pan with upturned lid onto another pan & upturned lid as I got more blase with them - I did start by nesting with paper plate inside each but soon realised how tough they are!
I'm about to replace my 12 year old circular pans, not because they are worn out, in fact they are as sturdy as ever... But I can't think what else I want for Christmas! My frying pans arent as good as the saucepans tho. I also do not dishwasher mine. They wash easy. I have never nested them. I treat them very well. But seems to be worth it!