I went to Willoughby with both DD's. With number 1 it was the BEST thing to ever happen to me! She was 8 months and up until then had NEVER slept more than 1.5 hours in a row EVER. After 1 night she slept perfectly and at 10 is still a remarkable sleeper (I say remarkable because I am the lightest sleeper on the planet).
Anyway, it was fantastic, they let her cry but I (or the nurse) were welcome to go in whenever I wanted to pat her. It basically taught her that a cot was where she went to sleep and once in she didnt' get up. It wasn't torturous or anything like that, was very easy, especially sharing the wing with three other mothers. Lots of support (by that time I was a total wreck from 8 months no sleep...).
DD2 was fine, more result once I got home. But a fantastic "break" to go there and be looked after with meals cooked for me, and lots of support networks to talk to. But like I said was better with her once at home, but I had all the skills I needed then, so it was still very beneficial. I was allowed go in whenever I wanted to settle her, it's not like they make you stay away and let bub cry for hours. They know what they're doing and I have nothing but praise for them. Enjoy and good luck xo