Before you go and buy this, I recommend you read the "Pros and Cons" of this drive. The rating doesn't look that good.
The next thing you should ask yourself is "why would I need or want this". For 120GB of storage, $700 is a lot of money to spend. Does the increase in speed justify the expenditure?
I started with a 160GB disk (not SSD) in my MBP. Within a few months, I was running out of space so I upgraded it to a 250GB disk. Well after 6 months with that, I again was running out of space and just recently upgraded to a 320GB drive.
My 320GB drive cost me less than 1/2 the price of the 120GB SSD drive you are looking at.
Just my 2cents worth.