Our little one was 2 when we got this. She loves watching Cosmic Kids Yoga and we thought this would be a hit. She's now (age 3) taken a liking to sitting with a parent once a day to learn about the cards and yoga positions. The mat is her prized possession and she does not like us moving it lol It has helped her learn responsibility as she wants to keep it clean and in tact - she wants to be the one to roll it out every morning for yoga and roll it back up every night to put it away safely.
She recently has started going to her yoga mat independently when she's becoming tired or frustrated. When she's doing yoga she will let us know to leave her be to focus on her yoga by saying "Shh, yoga time now" When she's done she will bring her hands to her heart and say "Namaste" then stand up and look at us and say "Ok, all done yoga"
I originally bought it because I figured if anything it was cute and could be a good test idea. But now I can't imagine her toddler years without it.