I've gone to other swimming schools/squads for children and this is a pleasant experience. If you don't want to sit around the pool (it's pretty humid in there), there's an air-conditioned viewing room where you can sit in comfort and watch your child through a window. You can let your younger children 'loose' in this room - there's a tv mounted on one of the walls if you're interested.
Warm showers near the pool for your child after their swim are convenient - the children can shower themselves - just press the button.
Pools are heated to a comfortable temperature - children get straight in.
Gone are the days when a crowd of screaming children were thrown together to learn to swim in a freezing pool and given minimal attention....hooray.

Approximate cost: $15