Using my Crucial M4 500GB drive, and haven't had any problems with it. Runs like a champ.

As for a speed boost in-game, it will probably be minimal. Possibly unnoticible, because your speed will be limited by your network connection in many cases.

I noticed no difference in 1.X or in FFXI between my mechanical HDD and SSD as far as in-game performance, but the programs load quicker when I launch them.

Even so, buy one. Fewer mechanical parts in your computer means less opportunities for things to break.