Pros: It works
Cons: it is not free
Easy to apply and to clean up.
Many bash it, but it still places in the top 10 in almost all legitimate tests compared to other TIM's. The difference between them is maybe 2-3°C, and for all but the most extreme users, that will not make a difference.
It does take time (200 hours) to reach maximum effectiveness, but really, you want to complain that something works better with use?
Some say it is hard to apply and clean up, I have found it is no harder (and sometimes easier) that other TIM's I have used.
People claim it is conductive, it is not. It is capacitive.
1) The ratio of charge to potential on an electrically charged, isolated conductor.
2) The ratio of the electric charge transferred from one to the other of a pair of conductors to the resulting potential difference between them.
The ability or power to conduct or transmit heat, electricity, or sound.
I also did a little experiment with it applying it directly to CPU pins. See HERE.
Basically, don't get it where it does not belong and your fine. If you do get it where it does not belong, clean it off and your fine.