Well, It has been three years since I purchased my Macbook Pro 15" it has an i5 2.4ghz processor and 4gb ram. During the past months, It has become extremely sluggish and HD is almost full. I mainly use my laptop for school to read PDFs, eBooks and watch Kaplan videos other than listening to music. I am considering investing in an SSD drive and upgrading the ram to 8gb or buy a new Macbook Air 13" for my school related work. I have not made up my mind yet on what to do but would like to know what you thought about this? Thanks for your input.