Works fine for me, on Fruit Factory hardware even. Close the thing, it goes to sleep. Open it, it wakes up. Leave it closed for a very very long time and it hibernates. Open it again and it comes back to life. Your experience may vary depending on what hardware you run it on but for me it works fine on the mentioned machines, on a HP Spectre 360, another HP Elitebook and on a really ancient Toshiba Satellite. I've had problems with sleep on a Thinkpad P50 with a discrete NVidia Quattro GPU, it goes to sleep but won't wake up so I have that machine set to hibernate as soon as the lid is closed. This takes a bit longer (but not that long, SSD is fast) but it would have been more pleasant to use if normal sleep worked as intended.