depends on who is using it.
for some, the speed gains are totally worth it.
for others, the more touchy nature and crappy reliability of the low-end SSD that most people can afford to buy are NOT worth the hassle.
FYI - a 750G WD Black 2.5" costs less than a 120G SSD, is noticeably (but not ridiculously) slower, is much more reliable, has way more space, and a longer warranty. but it does run a little bit warmer (not much, but ya a bit), and doesn't like being shaken-n-stirred while in use.