There is currently a bit of debate over whether he is a chucker I understand.
That's not quite true. He was reported as having a suspect action three years ago but tests established that his action was quite legitimate - there have been complaints since then, so there's certainly no 'current' debate on the matter.
What I don't understand is why he didn't play test cricket until he was 31. He's homing in on a 100 test wickets at about 30 runs in just 18 tests. Considering that he's done most of his bowling on flat, batting pitches that's a fair performance.