On the whole, DD's Dad and I manage to co-parent her without too many problems - there are occasional glitches, but nothing that effects DD significantly.
One thing that has always been an issue, and caused HUGE problems at first is the face that he and I have very different expectations about my availability by phone/email when SD is in his care.
I plan my work/leisure/errands around whether or not DD is In my care - so may not be able to instantly respond to his calls/txts/email. I trust that if it was an emergency, he would deal with it, leave me a message which I would respond to ASAP - but if I'm out with the girls or away for the weekend, I don't want to interrupt that by responding to a text about what time handover is going to be I'n three weeks time, or whether DD needs a new school cardigan!
He expects me to tell him when I am not going to be available to pick up the phone to him while DD is with him - when I'm working somewhere where i might not be able to answer straight away or the times of my flights if I'm going to visit family for the weekend.
I'm really not comfortable with this, and don't see how DD suffers if I don't respond to non-urgent issues for a couple of days - but how do others deal with this? Should I be available 24:7 if he wants to discuss something?