imgix.com - imagery for a website

I just stumbled over https://imgix.com which looks like it could speed up a website building process and reduce the time one needs to invest in preparing images.

The one claim they have somewhere on their website

Build your product, not the framework

rang with me. It actually well summarizes what they say they offer. Their service seems to go beyond hosting images on their CDN. I skimmed over their site and they auto-crop for avatars including face detection and auto-enhance image quality if desired.

What I don't get yet is how painless and really no-work this will be. Sounds all good, but also sounds like I would just do the work somewhere else then on my computer.