I've just had my first antagonist cycle at a new clinic after 3 unsuccessful long down reg cycles at my old clinic. The antagonist cycle produced my worst results ever. I knew to expect less eggs because I've heard the antagonist protocol usually produces less than long down reg, but I was hoping for better quality. I went from getting 5-6 eggs with about 75-100% fertilisation on the LDR protocol and at least one 8 cell embryo to transfer on day 3 to getting 3 eggs on the antagonist protocol with one fertilising and that embryo was 4 cells on day 3. I've read on Dr Sher's blog (SIRM) that he thinks the antagonist protocol is not good for older women.
I would love to hear others' experiences with these protocols. Also, did your FS tailor your protocol to you individually?