SQL Server case insensitive collation

Question

What are the benefits/drawbacks of using a case insensitive collation in SQL Server (in terms of query performance)?

I have a database that is currently using a case-ins

Answer 1

If you change the database collation but not the server collation (and they then don't match as a result), watch out when using temporary tables. Unless otherwise specified in their CREATE statement, they will use the server's default collation rather than that of the database which may cause JOINs or other comparisons against your DB's columns (assuming they're also changed to the DB's collation, as alluded to by Damien_The_Unbeliever) to fail.