We too tried OE before moving to DE at Cooper. We chose to do the entire cycle vs a split cycle in hopes of having enough for siblings. I think because we didn't have to wait on another couple things moved pretty quickly. It took a few weeks to hear that we got our first pick. We then signed the contracts and were able to cycle the next month.
If I remember correctly the donor pool listed if they had donated previously. This was important to us so if it wasn't on the list I asked. Tiffany and Terri were great and shared as much as they could. Before Cooper we wee looking at agencies and they shared a lot more info but Cooper had enough for us to feel comfortable. We also cycled when the economy was a little worse so the pool was a little larger and the number of couples cycling was smaller.
We have since gotten pregnant and are anxiously awaiting our little one's arrival.