Lenovo G580 is a good quality product .and Best parts for all.
I have Laptop lenovo G580 . and I use this Laptop before 4 years and No any problem this parts now till date. I use this Laptop regularly and Laptop feature are 4 gb ram and 500 gb Harddisk avaliable .and most feature in this Laptop that fan is avaliable whose that laptop is not heated . Lenovo battery backup is best also .when I purchase this product its battery backup is 4-5 hours and then now battery backup is same . so I say this product quality is very good.