Really good. When compared to Falcao (which actually makes a lot of sense, because their career paths have been quite similar), he has better goals coring record than Falcao in both Colombian and Portuguese leagues. I remember watching him play for Chiapas in Liga MX one time, he looked like Drogba in his prime: bigger, stronger, better than anyone else.
He's also quite fast and agile for a player of his size, that's why I think he is perfectly suited for the EPL. His heading abilities are similar to Giroud, but once again, his pace, mobility and athleticism makes him a better player in that department, because Giroud's diving headers reminds me more of falling brick than a header sometimes.
I'd say he's pretty much ambidextrous, because if you look at his goals, he can finish equally as good with both feet. What I like about him the most is probably his flair - great dribbling technique and ball control, which allows him to create chances not only for himself, but for his teammates too. As I've read somewhere before, he really likes to flirt with the off-side line, but that really isn't a problem because of his speed.
I'd say he's the definition of "complete forward", there really isn't a thing this guy can't do. It's time for him to leave Porto, they have been really poor this season and he seemed like the only one who was willing to play at some points. Arsenal would be perfect for him.