SSD question

i heard ssd gradually become slow after using, hdd more long-lasting. true?i'm considering 2012 mba, or slimmer 2012 mbp. know ssd faster,but want speed last long.opens apps fast, super responsive...like that.btw,do guys think 2012 mba refresh give away backlit keyboard?appreciated replies...

mid-2010 macbook,ipad 2,iphone 4s,ipod nano

 

they slow down fill up. details can found here:
http://en.wikipedia.org/wiki/write_amplification

however, when full, ssd drives have outperformed hdd.

 

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