Gymnastics trial class for a 4 year old near Habsiguda. What should I be looking for?

There's a gymnastics place near us running trial classes for 3 to 6 year olds. Our son has been asking since he watched his cousin's class, so we've booked one. The brochure promises 'motor development' and 'confidence'. Not useful. What should I watch during the trial? Number of coaches per child, mats, how long they stand in line? If you've done this at this age, what told you it was a good class or a bad one?