Buy it, download XCOM UTIL, and then enjoy. The X-Com Util mod makes the game ifinitely more playable, fixes bugs, and improves the interface greatly. Also, if you really want to enjoy it, on your first playthrough, dont look at any guides or strategy tips. Having to figure out what all the alien tech does and how it works adds a lot of atmosphere to the game, and makes it a lot more challenging.
That being said, X-com hates all of its players. Look up some vids of people playing it, and you'll understand why. If you hate games babying you and handing you wins, then you'll love xcom, because it makes you work for every single victory. You start out completely outnumbered, outgunned, and outpositioned. The alien ships can outrun yours with ease, their weapons are much more accurate and powerful, and some can even mind control your troops (not that this is much of a big deal, since almost none of your troops can hit the broad side of a barn on a good day) I've seen videos where in the first mission, guys will lose over half their troops, only to have the rest panic and turn on each other.
But, as you capture alien tech, learn their strategies and weaknesses, and begin to reverse engineer their weapons into much better and upgraded equipment, you can turn the tide. Nothing is more satisfying than the first time you have a full ship full of flying armor troops with Heavy Plasmas, you start mopping the floor with the aliens, and watch them panic and start to turn on each other.
Also, DO NOT GO NEAR CHRYSALLIDS! DONT TOUCH THEM, DONT GO NEAR THEM, DONT EVEN LOOK AT THEM. IF YOU SEE THEM NUKE THE SITE FROM ORBIT AND RUN LIKE HELL!!! You have been warned. You'll know them when you see them, because the moment you land at the terror site, the first three turns will be filled with screams, and then there will only be silence.