My dd never took much at the df- at the most 2-3oz. At 8 weeks she was consistently sleeping from df to 7am, so at 9 weeks I just stopped doing the df. The first night she woke at 5.30, I gave her 2oz and she went straight back to sleep. The next night she slept from 7 till 7am and continued to do so every subsequent night!
So the answer to your question is, yes, I did, and yes, it was successful!