I'm an Escape bride, and I did a room block. I chose all Value (Pop Century) for my guests because we had talked about it ahead of time. I actually knew when they would be staying, so I blocked rooms for those exact nights. When I asked about room discounts for my guests, DFTW offered to do a room block. I sent my WC the nights and the resort, and he drew up an addendum to our LOA. Once we sent it back, it has now taken about 2 weeks for it to take effect. My mom has been calling group reservations every once in a while to see if we're in the system yet. She was told that it doesn't matter when they book the rooms as there are that many guaranteed for them through the block. It has definitely taken the pressure off our families to have it!
Hope that helps!