Our school is currently in the process of becoming an IB PYP school so my information is based only to the Primary program.
Every IB school incorporates the IB structure into their own curriculum, so no 2 schools are alike. Schools are given certain personal and global themes which are to be melded into the current years curriculum.
There is no set curriculum benchmarks which means one IB school can be doing algebra for grade 2 and another not. As for Homework the same applies. In other words IB does not mean a set benchmark for academics, growth is the goal. According to State Standards we even have a few low performing PYP schools in our state.
I believe IB can be good for the gifted learner as it encourages global awareness and encourages students to evaluate how they fit into a global society.
Every PYP IB student is exposed to a foreign language and the IB schools are required to participate and make a contribution to their community. I like IB because students are taught about worldwide issues, learn how to focus on the bigger picture, and are encouraged to make a difference.
If you are considering an IB school, I encourage you to dig a little deeper than the IB label, especially if you want to know more about how they differentiate and their homework policies.
Good-luck and feel free to message me if you have any specific questions
I am knee deep in PYP IB data as I am on the team working to switch our school over to IB PYP.