My children, ages 13 and 11, are growing up with 50-50 parenting time. IF they wanted to spend time with their dad, this is a very ideal situation. They've had some issues with their dad not spending time with them, etc. etc. He recently got a girlfriend and wants to come back into their lives and it's getting better. We have always done 50-50 alternating weeks, but when he wasn't spending the time with them they didn't want to go anymore. Hopefully things will be right again now that he wants to try.
It's really a win-win for all involved. Both parents get quality, extended time with the children, and the children get the benefits of living with both parents,only at seperate times.
I would defeinatly do 50-50 again and quite honestly in my opinion is the only way to raise children in a split family.