Previously we used paper going back and forth from parents to teachers. I was initially concerned about how much resistance I was going to get from staff as control of the night was out of their hands.
Anecdotally our attendance from parents is way up - mainly because we aren't counting on the students to take a letter back and forth, knowing straight away which students haven't booked appointments is also a benefit, as it allows us to contact parents before the evening as opposed to after. It's also helped us realize that for some of our year groups we might have to run two nights, whereas previously a teacher would have juggled their appointments and chosen not to see some parents, now they can't do that easily, and it's noticeable that Teacher A has 54 slots fully booked, but another 20 parents that want to see him.
It's almost universally loved by our parents. The only complaint I can remember about the system specifically was from a grandparent who didn't want to use a computer to set up the appointments... we set them for him. I have recommended it to my own children's school, and I have fielded calls from quite a few of the lower schools in the area after parents of our students have suggested it - for every one of those calls I have fully endorsed it.
Mr Bryant, Meridian School