Welcome to the forum.
Cons:
Dusty
Can be demanding of attention.
Need a large cage despite the fact that they're small.
Need lots of toys to avoid boredom, like any parrot.
Can be very messy like all birds.
Picky eaters (it can be difficult to get them to eat fresh fruit and veggies, and other healthy foods).
Females tend to lay infertile eggs, and can have health issues due to this like egg binding and calcium deficiencies.
Can get easily injured as babies, especially if wings are clipped, so be careful.
Not the best talkers if that's something important to you. Only males talk I think.
Pros:
Very small beak which cannot do much damage to you or your house.
They're the smallest and easiest to care for in the Cockatoo family (yes, they are considered Cockatoos).
Beautiful, especially the various mutations. They have a gorgeous crest too, which can help you figure out their various moods, like big Cockatoos.
Love to whistle and tweet instead of screach and scream like other parrots.
Trainable.
Can be very cuddly, especially if you get a hand raised baby.
They are flock birds, so it's easy IMO, to get them to love your whole family, unlike some "one person" parrots.
Very sociable.
Live 20 to 30 years instead of 70+ so you can have them for a life time without worrying what will happen to them if they outlive you.
They're awesome birds and honestly, I paid $130 for mine, but he is priceless to me. He is also very beautiful, even if he's doing absolutely nothing in his cage, and napping, I could just sit and stare at him. The gorgeous feathers, long tail, adorable looks. I could go on and on.