It is very good laptop. I have not used this Lenovo G40-45 but I can say it is very good, because my friend has told me about it. He has been using this laptop for almost 7 months.
As it is a product of Lenovo, it is very easy to use. And can be used for any purpose.
The quality and durability of this laptop is very good.
The value of this laptop is affordable. And is worth the value.
The sevice and support is also good.
At the end I would say that it is a good laptop, that you can easily afford. And would suggest you to buy it.