CEMA on a resale purchase

Fees and time may eat up any savings, particularly if the lenders are separate institutions (this is why they're mostly done for refis. I don't know if it also affects the ability of the second lender to later securitize or otherwise assign the loan (so they will be reluctant to limit their later options).

Do you know which banks may facilitate this, if any? From what I've learned so far, Citi yes possibly; WF and HSBC no (at least based on the individuals I've spoken to).
It seems to me that additional fees would need to be several multiples of the standard R/E attorney fee in order to destroy the economics. For ex, a 1mm mortgage transfer yields a 19k savings. Typical R/E attorney fee in the 2-3k range, so would the CEMA cost multiples of that?
As far as extra time required, that's also something I'd like to hear about, if anyone has gone through the process. Whether or not it's a deal-breaker depends on how much time it actually is, and if either party is in a rush.