Model X555L – I bought it about a year ago to replace a Toshiba that I owned for 4 years and used everyday without fail. This Asus laptop has the same duties. Upside – its stable and fast and copes with the tasks I set upon it without problems. Downside – the mouse pad is too sensitive with the zoom – its always zooming in. The space bar has been made shorter – the proper way of typing is to use the right thumb to hit the space bar. Shortening the space bar, the keyboard has "alt" and another command button in place. I repeated hit those buttons rather than the space bar then hit the next alphabet key and I'm literally asking the computer to do an "alt" command. Drives me nuts, to the point I will never by another laptop with this type of keyboard.