We have two and love them, but they do have their cons, as any breed does. They bark all.the.time, very protective of our house. One also loves to steal our toddler's toys and destroys them. Neither one has back problems right now, but they are prone to them. In addition, our two have very bad outdoor allergies. Once spring arrives, they are itching and licking until the fall. Somewhat annoying!
On the pro side, they are loveable dogs and wonderful companions. They love to cuddle and burrow under blankets. They are energetic and love takign walks. We had no trouble housetraining ours, although they are known for issues with that.
I could go on all day, so if you would like more information. Let me know! Good luck!