....and if you want some feedback from someone who took a trial flight, and has gone on to complete a PPL.
On my trial flight the instructor didn't worry too much about the rudder, but we did explore the secondary effects of controls, and also the stall (because I asked him to). Essentially, once we were clear of the airfield he let me have control. The flight was a combination of sight-seeing and flying the aeroplane as per his instructions.
On the return trip, I flew it and landed it too, although of course heavily supervised. This for me was a bonus and I didn't stop talking about it for ages.
Overall, I enjoyed the flight more because I wanted to fly it as much as I could, but then again, I knew that I was going on to PPL stage.
As has been said, flexibility seems to be the key.
C23