Any experience using "shake" defragmenter?

Did anyone try using "shake" while the cluster is active? Any problems
with corruption or data loss? I ran the thing on my home directory and
nothing was broken. I didn't develop any performance test, so cannot
vouch for the effectiveness of the procedure. Did anyone play with that?
Any positive or negative things to say about shake?

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Mladen Gogala
Sr. Oracle DBA
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