Hello friends. I’m using ASUS R558U with OS Windows 10. It is one of the best laptop. It has got 4 GB RAM but you can extend it, 1 TB hard disk, 2GB+2GB graphics, CPU intel core i5-6200U, up to 2.8GHz. It has 2 year accidental warranty and service is very good, if you have any issue with your laptop call service center, and they wiil solve your problem within 2 days. The speakers are from Sonic Master which is very good. You can operate any Os on this system. The charging of battery is fast. The battery bachup of this laptop is up to 4 hours. It is very light weighted and a very good look. I personally recommend you if you are seeking for a laptop, take this one.