My iMac can shutdown in 2 seconds, and be back online in 5 seconds. Of course I just use the SLEEP function! :crazy: I don't get the fascination with the instant-on, wasn't that why "sleep" was invented? I use sleep mode, and reboot every few months.
Now that's with my OS X based computers, my Windows computer I don't even bother with the sleep function. I have never found it very reliable. Maybe if you have the right hardware combo, but for me it's always been problematic.