First of all Dell is reliable brand. XPS 15 series comes with second generation intel’s I series processor. Which are best in performance. Games run smooth because of Navida Geforce 500 series graphic card. Sound quality is awesome, it comes with JBL speakers. Even you can enjoy 3d movies on it its comes with 3dtv technology. Its battery life it very good near about 8 hours, it comes with 9 cell battery. DD3 Ram increase the performance as it comes with 6 and 8 gb ram options.
The bad thing is it is bulky.
Overall Its good I can give it 8 out of 10