I have seen CHICAGO atleast twice every year since it has been on Broadway, and I have never once seen it stale or boring. Ever.
And trust me, many times I expected it to be - whenever I return to long-running shows (Q, PHANTOM, PRODUCERS, etc.) I always anticipate the staleness - but CHICAGO is one of the very few long running shows that remain fresh night after night.
IT's in glorious shape, and it's as fun and sexy as it was nearly 10 years ago.
"If you are going to do something, do it well. And leave something witchy."
-Charlie Manson