I took one spinning class at S3 recently and didn'...

I took one spinning class at S3 recently and didn't find it a real work out- more like a disco session!
Let's start with the hardware: the bikes! Seats and handles have one fix length - odd!
Now, about the class - most of the time in position 3 - the songs were repetitive - I didn't feel the energy out of the class.
Ok- with another instructor I would go again. Why? The choreography -is impressive- the lights change color, dim, turn off and are coordinated with the duration of each song- pretty cool.