You have to pay for each director so they can join in on a collaboration (Newzik Essentials $24.99 one time) but I really like it. There are layers so you can easily hide other directors markings.

Other staff members will make notes on what they are hearing instead of interrupting rehearsal (although sometime we still go that route too) - we can all see each others notes and we all help with each other's band. Periodically we will clear all markings and start fresh so things do not get too cluttered. When I want to just see my own notes, there is a layer I can select to show that. It works well for us, we all have ipads and use them regularly so it works well.

They have $50 a year subscription model that has a ton of other features but I don't think I need it.

That being said I do slightly prefer ForScore and if they came out with that feature and it was reasonable cost, I would probably switch.