You will notice a somewhat decent improvement, but I don't think it's worth almost 100 bux for it, especially when you're losing 20gb of space.
I would say go for the 120 5k drive, or better yet, if they have the choice, try and get...
But doesn't recharding battery decrease battery life.
Obviously if you use ur battery and then recharge it it's gonna affect it's life.
But as others have said, once the battery is fully charged, it will...
First of all, make sure that your vents are not clogged with dust, and that the fans are also clear.
After that, look into undervolting and make sure to keep the laptop on a nice flat surface with plenty of room underneath.