My kids are older than yours, but we've been doing a 50/ 50 split (week/ week) for 7 months now and it's worked quite well. We hand off on Sunday afternoons. The kids adjusted pretty quickly. In fact, originally they loved the idea of having their own bedrooms in two separate homes, it was like a new adventure. They eventually got tired of moving back and forth and wanted to be back under one roof, but then they settled into the routine and it's been going well ever since.
My brother and his X do a 2/3/2 split and it works OK for them, but he said the kids are always on the move it seems like. He says it's hard to keep track of when the handoffs are too.
I like the week/ week split because it's easier to deal with homework, projects and extracurricular activities. The disadvantage is a week is a long time to go without seeing the kids, but I see them briefly after school each day even when it's not my week.
