I think they are a bit overpriced but in the end you get what you pay for. I put a set of Pazzo's on 1 and Chazzo's on another once at same time, and after a few months of i'd say pretty close to the same riding on both the Pazzo's were still as smooth and crisp as the day they went on as where the Chazzo's felt more notchy, where honestly unless you could try them both side by side knowing they had same use you probably wouldn't be able to tell if you just had the Chazzo's. But by comparing side by side to the Pazzo's you can no doubt tell the difference.
I would say it is the same as when your around someone everyday and they gain some weight over time, you really don't notice it. But if you were to not see that person for a while and they put on the same amount of weight it would stand out to you big time. Just like tires, start out nice a new and feeling good but as they wear out you gradually adjust the way you ride with them wearing. And then when you get fresh ones it's all good all over again and you wonder why you waited so long to get them.
Except paying the higher price for the name brand levers keeps you with that good new feeling you started with. Just Saying...