I would love to start this. Something productive to do while watching TV or movie - I can rarely sit and just watch. And, I can make some sweet things for my baby. Cons: I would have to learn almost from scratch on my own, and that's why I haven't started yet. High-probability of half-finished projects.
It's like a productive meditation! So wonderfully relaxing. Not to mention it's easy to learn and very portable. Cons: Depending on the project it can be pretty time intensive or expensive (depending on the materials used).