I hadn't heard of Crispi before, so I checked them out on the web. They look great and are recommended by people I trust...like the posters here. Unfortunately, there isn't a retailer anywhere near me or I'd go try on a pair. I have really bad feet and I'm always looking for comfortable, supportive boots.
I think a lot of boots are too heavy, bulky and stiff for Africa. They are absolutely needed when chasing elk out West in often wet and cold conditions and of course for sheep and goats anywhere. The last couple of trips to Africa, I've worn extremely light, kinda minimalist boots. The places I've been don't present much in the way of mountaineering and of course I'm not wearing a pack. I've been wearing a pair of Lems Boulder boots and plan to wear them in Zimbabwe soon. The pair weighs 10 ounces which is incredibly light. They have a pliable sole that can even be folded in half...the toe stuck into the heel. The uppers are cordura, and have worn well while I've had them the last year. They are NOT for extended treks on rocky terrain, but I think they'll do well in Africa. I'll let you all know when I'm back.