The sound, especially in the first half was very poor, boomy and quite chaotic sounding. As above, the bass had little definition. As it went on,the sound got a bit better, and the quieter passages were really nice.
I would have loved it to be in a smaller venue where they weren't trying to do a big rock show, as this is groovy, subtle music, and in this particular venue, these things were lost a fair bit of the time. The highlights were still good, but on the whole, I was left a bit disappointed.
For loud music, Cheltenham Town Hall really needs some acoustic treatment, imho.