Saw him last night, he definitely seemed to struggle in the higher range. Though all I have to compare is the cast recording; I didn't see him back when it opened. Side note, Andy Karl was great.
I much preferred Criss's vocals, as well as his interpretation of the role. He had a more slimy personality, which /i think fits Finch better than Radcliffe's more earnest acting. I'm sure the mistakes will get better over time, too bad he doesn't have very long.