I love Brian Cox. I follow him on twitter. His Wonder series are my favorite series involving space since Carl Sagan's Cosmos. His voice is hypnotizing and he makes me wish that I was as smart as him.
Pretty much all of this (though I don't really keep up with Twitter), I love the sense of amazement and wonder he conveys with his voice. You can really tell it's something he's passionate about. Also, he still manages to bring up new things I hadn't known, which is getting rarer for these kinds of shows as I educate myself further on the subjects.
Side note: Much anticipating the new Cosmos with Neil Tyson