If you are concerned, which I would be after you brief experience and want everything to be as good as you expect, ask to see a previous job.

I am always more than happy to take a client to as many previous jobs to gain their trust, normally taking them to the last job, with similar equipment to what I would be proposing for the new job is enough.

I also make a point of leaving the room and leaving the the clients to talk in private. I have nothing to be worried about and have never lost a job when going to this effort.