I put off watching this and when I did start I thought I'd probably not watch it through to the end. However I did as I couldn't remember Bolts results at the 2016 Olympics which kept me more interested than maybe the documentary justified.
There were quite a lot of conversations between Bolt and his trainer/friends etc which I couldn't quite understand, but I don't think I missed much. Bolt seems like a nice chap but there were way too many scenes of him just chatting to his camera phone - this wasn't great.
This could have been half an hour shorter and more time spent showing races rather than the associated before/after banter. So certainly watchable, but could have been so much better.