I have a Dell latitude E6540. I used it since 1 year. A price range is little high but when you use it its quite a smoothie. I am a civil engineer so obviously I have to run a big softwares but even though its give a smooth using. It is never hang in 1 year. A little problem was of battery. Because charging decrease as time passes. But I think its not a big deal for those who want to work in office.