The boppy was something we used everyday not only when I was nursing but for bottle feeding too. Pretty much every three hours you could find me on the floor leaned up against my recliner with a bottle in each hand feeding the boys on their boppys. Even when they could hold their own bottles we still used the boppys to prop them up on.
We had a mobile when the boys were in the same crib but when the boys moved to seperate cribs we used this Fisher Price Ocean Wonders music projector. Have you ever tried to sync two mobiles together? It is impossible, it just sounds like a jumbled mess. That is when we switched to this and both boys can see and hear it from their individual cribs. Don't have twins? I would still reccomend this just because it is cheaper and will last longer (you should not have a mobile once your child is old enough to grab it).
I was not paid for any of my opinions in this post. I just love these products and hope this list can help someone else out.