Rman no catalog or no repository

I need some clarification about rman configuration without repository
and catalog.I like to configure for a smal database (solaris9, oracle
9.2 ,100gb).
My conclusion about rman configuration without repository and nocatalog
The metadata will be in controlfile and it wil be reused depends upon
the value of parameter control_file_keep_record
If i proper backup of full database (including cotnrolfile) i can
recover the data if the database or system crashes.
1) Can u specify whats is the advantages and disadvantages if i am
using rman in same database without catalog and without repository.

You may want to read the following.
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96566/rcmrepos.htm#431413

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