That's a great bag for you, and 2.5 years of constant wear sounds really respectable to me.

I used to be a one-bag person and I would get about 2 or 3 years wear from them. I did switch out the winter bag for a straw one or similar in summer. But summer is short here.

Now I have several bags per season so the situation is quite different. They seem to be lasting really well, though. I don't have signs of wear on many of them.