I absolutely adore slab serif and Bitter in particular. It's so clear and punchy. It's good on display, on print and on kindle and it's free too. The only down

I absolutely adore slab serif and Bitter in particular. It's so clear and punchy. It's good on display, on print and on kindle and it's free too. The only downside I think is that people are sometimes distracted because they're not quite used to and surprised by something that is so ... readable!