I have just acquired my first set of Grado GS1000's, at approximately 3-4 years old, these are the non-i version.
They have only had a claimed 15-25 hours use prior to my initial testing, these cans are not broken in, they will require 100-200 hours before properly warmed.
Pros: Amazing Soundstage, Precise Imaging, Nothing Short Of Breath-taking
Summary: How much? Ah yes, that price: there’s no getting around it, £1000 is a hell of a lot of money to pay for a pair of headphones, especially when they make you look like a period drama Marconi operator.