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.