I thought his speech was well done. However, it's still early, so I'm going to wait and see how things pan out all around.
The one "negative" thing I see is that some people see him, as related to the Republican party, as many of us see Ted Nugent as related to the NRA. He says things that need to be said, but I'm not sure if that helps, or hurts, his electability among the population in general.