Works good for me:

Major:
5 of 5 boots after shutdown.
5 of 5 boots after reboot.
First boot after shutdown hanged though.

Suspend:
Works always for me 10 of 10. Checked different states.

Hibernate:
Works most of the time but sometimes hangs.
Have seen a lot hangs on 'battery' state. But last boot to confirm worked fine
2 times.
2 hangs in default 'balanced' mode. After this hangs got 2-3 hangs in a row
after shutdowns.

Minor:
If I run 'glxgear' hibernate resumes with slow Xorg, sometimes dies after
resume.
Same works with suspend.