Hi Bill,
It is different, at least to my tastes, that caramel. What I found works best for the caramel taste is Thomas Fawcett and Sons' Crystal II. When I first started brewing English beers, I was using normal American crystal 60 and it just didn't have that caramel character to it. Adding a half pound of crystal II has really change them up for me.
A half pound of special B in an ESB might be a bit much. It holds its own in the Dubbel because that is a 7%abv beer and has a lot going on. I'd worry that the special B in the ESB would just dominate the beer too much and make it almost cloying. I have not actually tried it though. It would be worth a shot.
Barry