11g upgrade pros and cons

Folks,
If there's already a similar thread, apologies in advance.
I wanted to gather some information on the pros and cons of upgrading to 11g from 9i and from 10g (Enterprise Editio) rdbms on Solaris.
What are the challenges you have faced (especially if you have tweak SQLs/optimizer etc.) post upgrade?
Any issues DURING the upgrade?
If I missed anything obvious that worth bringing up, please do so.
Thanks for your time!
Regards..

Pros/cons depends on the database type and activities ( no. of user/ data/ transaction etc).
but i would suggest upgrade your database (9i is history).
you will get many new features in database which are not available in 9i.
1. upgrade on test server
2. check the performance
3. everything goes well
4. upgrade on live server

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