Mine is x72d series. I paid 800$ and it is by far the worst machine I've ever had. I've heard nothing but good about ASUS, took trial and error to find out that they build the worst computers on the market. ine shuts off at random without displaying warnings beforehand or telling me afterward what went wrong, the language changes on the keyboard. The lighting changes, the sleep timer turns back on after I turn it off. Has a hard time connecting to the internet sometimes, key-lag, if that makes any sense, sometimes a key will lag out and I have to press it several times before it kicks it, notably the P, hot, constantly, even when it's running nothing, the list goes on and on, these are just a few things off the top of my head. I have a hard time not smashing this thing to pieces with all the trouble it has given me. I have a hard time believing that it's legal to sell something so horribly unfit for use to anyone. ASUS= Colossal piece of ***. I wouldn't recommend buying one in this series or even giving money to the company. It astounds me how some people can get it right the first time, then while trying to improve, *** up every last thing about that gave it value. This is the future of technology. The only good use for this piece of garbage would be to smash the CEO of Asus' goddamn head in until he computes just about as well as his electronic counterpart.