Well it works for me ....as it is hard work raising 3 kids alone ...so yes ill admit i agreed to it to keep my sanity as raising 3 kids 13 5 and 2 1/2 is hard slog for 10 days straight and trying to squeeze work in as well.
I do 50:50 with the younger two nearly 5 and 2 1/2 and now is works well (since ex has split with the live in nanny) We use a family day care as well as he works and i do as well... so on the off weeks thats when i work my bum off...my oldest son sees his dad the weekends the others go but he comes home the tues after training at 7pm so i get 5 days reprieve... but he is off on the bus in morning and home by bus and when i work he goes to a friends house until i get home ...

Like tonight im exhausted mentally and physically and i cant wait for the tomorrow as my 5 days start .... it works the kids see the father and they have a less stressed out mum!
BUt it only works if you really make it work and explain to the kids why in simple terms...

Sorry for the ramble i hope that made sense
Sorry, I hope you didn't take my comment about convenience the wrong way. The person I'm talking about didn't work, or have other children at the time, & only seemed interested in her weeks off.
Everyone is different. I know how you feel, I am raising 4 alone, 365 days a year & working part time taking my youngest to work with me because I have no one to take her. I'd love the choice of week on/week off! But with my kids father, I would never allow it