Hi kelan, welcome to BPO! I have a 2 year old Newfie girl named Sierra. I love her to pieces and I plan on getting as many as my fiance will allow me to have. She is the sweetest dog I have ever owned. She truly believes every person she meets is her best friend. She's loyal, she's a big couch potato but always up for an adventure when it's offered. And like Melissa said, she doesn't eat a whole heck of a lot even though she is a giant breed.
As for the cons of owning a Newf, I really don't have much to add to what Melissa said except to expect water in your house on a regular basis. It doesn't matter if it's a lake, puddle or water dish, Sierra will try to fit her big self in it. And as for the drool, I've given up trying to find a fashionable way to carry a drool towel.
For me, the pros of having a Newf by far outweigh the cons. She's an amazing dog.