Has anyone converted a Bootstrap based website to Craft?
I built Progress.org using Craft and Bootstrap—and it only took me about two months of part-time work. I’d say Craft and Bootstrap together are a match made in heaven. Here’s why:

1) Bootstrap is an out-of-the-box template that gives you great flexibility if you want to design your website how you want it to look. I found other frameworks like WordPress overly constraining.

2) Craft allows for near unlimited customizations as long as you know your front-end HTML/CSS.

If you know your HTML/CSS, then a Bootstrap/Craft combination is ideal, in my experience.