New front derailleur

I've been looking around and the ultegra braze-on (6700) appears to be the best value, but I've noticed that in almost all of the retailers they state "for use with 6700 shifters only" - I paraphrase.

You can see it here:

http://www.merlincycles.com/bike-shop/road-parts/transmission/derailleurs-front-road/shimano-ultegra-6700-front-derailleur-silver-braze-on.html

Now I'm assuming this is utter rubbish as all I've heard about Shimano in the past is that everything is compatible with everything else, and also as this text is used all over the place I'm assuming that it's from Shimano themselves who would of course want people to change shifters whilst they were at it!!

That said, can I please check with someone that this will be compatible with my 105 (5600) shifters, and that Shimano haven't done something strange to the pull ratio etc for the latest version of ultegra?

Thanks in advance.

Rich