I can attest to how well designed Autofac is.

I had to decide on which DI framework to use on a small front end WPF application that I worked on at a job last year (the app had a lot of singleton classes that were impossible to unit test hence why I needed to introduce a DI framework). I'd come from a job where larger framework choices had been made years prior by senior developers and their framework of choice at the time was Microsoft's Unity so that was what I had worked with for ~5 years. After a week or so of research and deliberation I decided to go with Autofac and found it to be really easy to set up and use. For me it hit the sweet spot between built in functionality and performance.