Benefits of upgrading to 3.0?

[eluser]ivantcholakov[/eluser]
You should revise your site against this check-list: https://github.com/EllisLab/CodeIgniter/...de_300.rst

"Step 6: Convert your Session usage from library to driver" - is a subject to be changed, because the Session library will be replaced before the release.

If you use database stored sessions, then check whether the schema of the corresponding table (ci_sessions) is actual. At the moment such information could be found here: https://github.com/EllisLab/CodeIgniter/issues/3073.

The other things are trivial.