Even though affection is nice from a pet, it may become overwhelming. Just think it through before you take one.
I speak from own experience. I had two cats. Amin and Toto, very affectionate cats. They were affectionate towards me like puppies are towards their masters. Every time I came home, they were welcoming me. If I left the room, both ran before me to the same room. I couldn't even go to a toilet without meows behind the door. At first, it was adorable and funny, but when you come from the work, exhausted after a long day, and there is two creatures that wish to demand your un-dividable attention.. it was too much to bear. No matter the amount I played with them, they were - all the time - in my legs. Day after day. I did feel that I had to take care of two babies instead of cats.
I got these cats about a 1 year old from their original home. I think it is very possible that they were took too young to their previous home and they developed fixation towards their owner. When I felt I couldn't take it anymore (when the cat-unrelated depression sunk in, as I felt that I was barely able to take care of myself) I gave them away, one for my brother and one for my good friend. They gladly took the cats, as they had been thinking about getting a cat beforehand. Amin and Toto are living happily now, seperated, but happy, and I'm happy they are doing well. I still feel remorse that I could not take care of them, even though I know they were demanding cases.
I remember how I felt a night before when they were sleeping in my legs before I gave them away. Happily purring, they had the habit to sleep on my both legs. These creatures really love me, but I can't take their overwhelming love as it took more than I could possibly give.