Not bad at all. And Henry is more humorous than normal and seems to capture the spirit of Napoleon Solo. His speech pattern sounds reminiscent of Robert Vaughn here, as if he's doing an impression.
Armie Hammer seems a bit more wooden though and not quite like how Ilya Kuryakin was. He seems more of a strong, silent type, similar to how Arnold Schwarzenegger was in Red Heat. I think I would've liked to have seen him more mellow.
I hope the soundtrack isn't like that in the film though. I was hoping for the actual Man from Uncle theme and was a little disappointed we didn't get it. Even the soundtrack we got in the trailer doesn't sound all that 60-ish.