Who has used Oracle Migration Utility

We are about to upgrade from Oracle V6.0.37.6 to V7.1.6 on Unix platforms. We want to use Oracle Migration Utility to upgrade the databases. Size of the databases is 2Gb - 12Gb.

We did some tests with the Oracle Migration Utility and found some problems but workarounds are available.
There is still the doubt if the database is converted properly.

There must be large sites where Export/Import takes too long and Migration is the only option. We would appreciate it if you would share your experiences with us.
What is particular interesting is if you had problems with the converted database in the period after conversion.

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Anton Buijs,
Nedlloyd Computer Services B.V.
Boompjes 40, 3011 XB Rotterdam 
The Netherlands
Phone:    +31 10 4007369
Fax:      +31 10 4006345
Internet: oracle_at_cco.wnc.nedlloyd.nl