Ok, thanks for all the responses. I see there are some advantages in adopting some of these transfer structures. Anyway...Browsing through CC's of some world class pairs, I didn't see any of them including nf responses after our side's overcalls. Yet Mike Lawrence recommends these in his book. You're now playing transfer advances, but there are many situations where you need to bid suits naturally. Do you prefer to play these as forcing or nf yet constructive, and play the transfer to pard's suit as sound raise/any unbiddable GF?