Supposed to be flat shooting and very consistant. On the other hand, I've heard it called an answer to a question that no one has asked.
I've never had the desire to get one, but there's been talk over on the CZ Forum that one of the barrel makers "might" make a .357 SIG barrel for the CZ 100. If they do, I just might pick one up to check it out myself with out the expense of a whole new gun. Who know, I might like the thing.
I did do a bit of research when it first came out. It's not actually .357, but .355 (9mm) and the brass, although described as a necked-down .40, it isn't. A true necked down .40 would be too short and this round supposedly headspaces on the case mouth and not the shoulder.
That's about all I know (or think I know).
--
Mike