I've done it three times - all with negative results reported by all hands. We all liked each others' styles of DMing - but they were all slightly different from each others'. It's like sleeping with different people every night... sure, it's fun, but you can never really get into a groove like you can with one person.
And by the time you make the circuit, it's not the way you left it when you were last in charge of the whips and chains.
And the DMing is different, too! ;-)