Pros
There are a lot of really great people that work at Intrexon. There are also a number of very interesting problems to be solved. The environment has improved significantly at a number of the sites in recent times. The CEO also cares a lot and works hard to make this company successful. It is often easy to doubt Intrexon but in the long run it is very likely it will be a highly successful company from a monetary standpoint.
Cons
Long list. The company has had serious issues in the past which are best summarized by other reviews on this site. I have read through almost all of the reviews and even the worst ones are unfortunately pretty accurate. There are also a quantifiable number of relatively unqualified people who get by playing politics given the lack of strong organizational structure at the higher levels of the company.