The case on the Vostro 1500 is made by Foxconn. The Vostro has a wifi switch that allows you to turn it off or on and when the laptop is off, you can use it as a wifi locater to see if there is wireless in the area. The Vostro also has a SD/Memory stick reader on the side. Finally, the Vostro's (could just be the 9 cell) battery sticks out past the back of the laptop. I've never used a 1520, but those would be the differences that I think there is a possibly of being.