N.L.
My husband had been taking my now 30 mo to Kids First Swim School in Cockeysville since she was about 11 months. They go each Friday night to a Mommy & Me class. He likes it for the "acclimation" that it gives to the kids. The best part is the water is WARM. Like, if you are in the pool area w/ anything on other than a swimsuit, you'll be HOT!
She didn't like it at first, but he kept her going and pushing her and now she loves it. She's ready for swim instruction, except that she's too immature still due to her age.
I say go for it. And, I really wanted to pull her out at the beginning b/c she cried so much!