Sound quality via headphones was terrible. Constant interference and crackling.
English commentary was dull - absolutely no excitement from the recording at all. Track was out of sync and had long pauses. Other tours have included some music during sites when there was no commentary - on here, you get dead silence.
Tour route was average. There are other providers who run a similar route.
Staff varied between aggressive ticket sellers to disinterested on-board staff.
Choose your bus carefully, as these guys run a number of buses in different livery, but it looked like the service was the same.