I have the 15" and wish I had gotten the SSD - for $100 more it is a steal. I have since put in a Samsung SSD 6G but would have been very happy to have it as part of the original purchase even though the one apple uses only is a 3GB bus model - I do not think I would have noticed the difference
I've got a late 2011 Macbook Pro 13 2.8 i7 running a standard Apple 128Gb SSD... no problems at all so far. After 3 HDD failures in 2011 and all of that pain attached to that, I've decided to avoid rotational media - call it my New Year resolution. I even use an external OWC Elite Al-Pro SSD drive for additional storage!
I wouldn't give 2 cents for Apple's slow and overpriced SSD options. I've yet to see one of theirs outperform the myriad of other 3rd party options. Plus other SSD's are cheaper and relatively easy to install. May as well put some cheap RAM in it too while it's open.
The only reason to use Apple's SSD offering would be for the warranty. It would be covered under AppleCare and you wouldn't have to deal with another manufacturer should problems arise.
IMHO, it's a great deal for just $100 more, as long as you don't need more than 128GB.
I have a 2010 MacBook Pro with the 128GB and a 2011 with 750GB 7200RPM and the speed difference still amazes me daily. I can have the computer with the SSD booted, playing an iTunes song, and photoshop open by the time the regular HDD equipped computer reaches the desktop.
I have an 80gb Intel x25-m ssd (yes, an "old" ssd). But even though it's a generation behind the drives you guys are using, it's still pretty quick. And of course it's miles better than a spinning hdd.
Congrats on the decision to go with the SSD - you won't regret it. Ever since I got the Rev A Air with the SSD option I've been unable to go back; best advancement in computing in as long as I can remember in terms of how it affects day to day usability.
I went with the 512GB one, because I'm crazy. But I love it. I love the entire machine.