Depends what you want to store on it. If you're happy with your private video and photo collection being stored on an external storage device then 128gb would be good.,How much space do you need? Is 128GB enough on a Macbook Pro?
I completely agree. My work machine (no media or video) needs less than 75gb for source code and apps. If you have photos, videos or music. Double that or more depending how how big your libraries are.If all you use it for is email, music, and internet browsing. If you want to do anything related to photos, music production, video, etc. then you will regret having such low space.