My daughter is almost 8 months, and we've been doing the NCSS on and off for a while -- I feel like any time I start to see improvement, something happens (teething, travel, illness) that then gets in the way, so I can't really say for sure whether I feel like it's "worked" for us, though I do plan to start working more seriously on sleep next week once my daughter and I are over this killer cold/cough/stomach virus combo that's been making us both miserable. (Nothing like having the baby finally sound asleep beside you only to wake her with a coughing fit, right?).
That said, I have found recently that often if she's wiggling/rooting/rubbing her eyes a little when I unlatch her, a firm hand on her arm and a "sssh" will get her to settle into my arm, and then she'll usually accept it and stay asleep. Could be worth a try, especially if you've been working on a keyword like "sssh." I was surprised the first time I tried that and it worked -- it hadn't even occurred to me that she would "listen" and realize it was okay to sleep!
Also, thought I'd mention just in case it's relevant to anyone -- I had oversupply for a long time, and almost always did just one-breast-per-feeding. But around 7 months, it just started to seem like maybe dd was getting sleepy at the breast but refusing to give it up not because she wanted more comfort, but because she wanted more milk and was too sleepy to nurse an almost empty breast. I started offering the second breast, and once she'd nursed a little more, she started accepting my pull-offs much more readily. I'd had oversupply for so long that it took a while to occur to me that she might genuinely need more milk!