The downside is that it may stuck in your little face hairs. I look like a hairy peach with this on (especially when not wearing makeup).
It's heavily fragranced and very unpleasant!
Another subjective experience is my skin sensitivity. So, let's suppose I apply this sunscreen on lunchtime. By the dinnertime, my face gets red and itchy, my eyes are tearing and they might get red too. I'm experiencing this only in the days when I wear this sun spray. That's why I've linked my irritation with this product.
Your mileage may vary, though. If you love La Roche Posay sunscreens, you will enjoy this too.