Mine boots up in around 14-17 seconds (until the desktop appears and then it's basically ready to go).
Shuts down in around 4-5 seconds, sometimes longer - don't know why. (It's the same with my 13" that doesn't have an SSD, but a standard HDD - on Lion it used to shut down in 3-4 seconds, but after ML upgrade it takes him longer).
Nevertheless I love the SSD in my 15". It's incredibly fast. I mean I've read it's fast and I've seen the stats people shared here, but you gotta experience it by yourself to truly appreciate the difference.
I'm a bit confused by what the OP has posted - my 13" (high end late 2011) has basically the opposite results - 30 sec. to boot, 5-8 to shut down...