People just don't understand the concept of deep sleep. That's why sometimes it's instant, and other times it isn't. And for people claiming that it's gone in other ROMs, maybe the ROM dev has eliminated the deep sleep mode by keeping a wakelock.
Sent from my GT-I9100 using xda premium
What's even more annoying is the two seconds it takes to turn on the screen to hang up a phone call. Again, the DHD turn on the display instantly.
These issues aren't a deal breaker for me but they're annoying.