The only con I found was that a few of the colors, like the Cadmium Blue and Burnt Umber, were a little less intense pigment wise. They came out of the tube in vivid colors, but did not exhibit quite full capacity when spread over the canvas. As I tried to lay on a substantial layer, the brush would scrape away the paint and reveal the white of the canvas coming through a bit. If you are someone who paints with a really thick application then this would likely not be an issue for you but for someone like me who tends to blend relatively thin layers, I would feel the need for an underpainting.
I would also say that as a person who paints people quite often, I would also like to see at least one more brown in the collection. I most often use ochre yellow, burnt sienna and raw umber. This set has a good Ochre Yellow, but the Burnt Umber fell a little flat for me. I think having both a raw umber and burnt sienna is important because then you have both a warm dark brown as well as a cool dark brown that are both seen often in skin tones. But of course no paint set will have every single color an artist wants, so it doesn’t necessarily make a set undesirable that you may need to add a few colors once you figure out exactly what you need, just like when you become better at anything and learn how the equipment works more precisely and what benefits your personal skills the best.