I have definately found it helpful with my boys. Top Barks reccommended it whn Harry arrived as Ben really didn't like him at all so we used to hand feed them small amounts several times a day. From what I remember of Marks explanation I think it helps your dog to associate good things happening when they sit quietly and behave well next to the other dog. So that Ben had a positive association to Harry being close to him as he came to realise that having Harry next to him menat he was likely to get treats

When Ben was getting revved up and cross with Harry I would call them both over and feed together and it seemed to calm the situation down. It didn't stop all the fights as if I didn't noticed the warning signs Ben would be too far gone to be placated by feeding him but most of the time it was excellent.
I still do it once a day just so that Ben remembers that sitting close to Harry means he gets the good stuff

hope it works ok for you - would be interested to hear how you get on.