Another significant problem with maintenance plans, well documented, is that the 'Verify Backups' check box doesn't translate to backups WITH CHECKSUM. It actuall runs a restore verify only immediately after the backup, I don't understand why they don't use WITH CHECKSUM (when possible) if this option is enabled.

If you assume some responsibility for mature production database servers with maintenance plans that have been running for years, its difficult to make the case to management that they should all be replaced with T-SQL jobs so they can use CHECKSUM.