You have to tread lightly when buying these off eBay. There are many counterfeit copies for sale. Some even will work for a while and the 3 months later you get a message that the serial is no good. With that said there are still legit copies for cheap.
X5 is buggy x3 is much better if you don't want the current bells and whistles
X5 is buggy x3 is much better if you don't want the current bells and whistles