No doubt dell launch as so many product but inspiron 15 3521 is the cheap and best product for us. I have been using this product from 3 years but no problems were found.In this product we can use all type of OS(window 7, 8, 8.1, 10 and etc) and it works smoothly.No one can give this type product in this range. and also you can get service centre everywhere in india. this is easy to use looking nice and you cann’t feel bore when you operate this product.