I've been to the RH Centre for the Performing Arts a few times including last night's York Symphony Orchestra's performance of Showtime at the Movies.
The staff are friendly, the seats are comfortable and there's plenty of parking behind the building. The lobby and washrooms were clean too.
We made the mistake of selecting seats too close to the front. From row G, we couldn't see all the symphony members because they were hidden behind their music stands. At intermission, we moved to empty seats in row M and thoroughly enjoyed being able to see everything on stage.