I own a 13″ MacBook Air mid 2013 with an i7 and 8GB RAM upgrade. Is it worth it to buy a model from 2017? I'm a web developer and MacBook Air, while not a performance beast, is enough for most of my work. I dislike MacBook Pro, I don't like the design and the problems with it. As far as I have seen, CPU is virtually the same after these 4 years. If I trust the benchmarks, there is almost no difference. SSD seems to be much faster in new models. My SSD is about 700 MB/s at read and 600 MB/s at write. I'm not aware of any other improvements. I will either replace just the battery, buy a new Air or maybe try to like the Pro. I will of course wait until WWDC to see if there are 2018 models on the way.