My 2.5 YO daughter loves this show. I started showing it for her to help with her one-to-one correspondence. She's really excited to count now, and enjoys the interactivity of the show.
My main problem is that the two "human" characters are very gender separate. The girl, "Millie" has powers related to changing patterns on her dress. Her pigtails are measuring tapes. The boy "Geo" makes shapes with his belt. Geo or the robot, "Bot" performs all physical activities. Millie doesn't do anything physical. It's extremely pink/blue gender separate in a number of ways.
I find myself trying to have abstract conversations with my daughter about why it's not fair that Millie can't use roller skates and skateboards. The problem is that this type of messaging is too subtle to be actively grasped by a child of my daughter's age, but she will be absorbing it nonetheless.
Overall, I think this show is good for helping my kid with math, but it's regrettable how gender is treated. I really wish it was more gender neutral.