Been using the 2015 12 inch macbook retina since 2015. recently the display broke. so will buy an used macbook pro 13 inch 2015 model with dual core i5 2.7 ghz and 8gb ram. i will be using this for at least next 3 years. I dont do any heavy works. mostly a lot of browsing, email, youtube and netflix. Will this be good enough for next 3 years or it will lag/slow down?