I've seen his name on a number of other conferences along with the likes of Tim LaHaye and Liz Curtis-Higgs, so he has some legitimacy as an author, but I can't say if this conference is any good.
BTW, what do you mean by "not so nice"? The best rejection I got in the early years was from an agent who told me my story was "too familiar" and my characters were cliche. He was right.
I'd rather have a direct and perhaps harsh criticism that gives me some help, than a "not for us" rejection.