Is the Costway 12V go kart worth it for a first ride-on?

Yes for a 3 to 7 year old on flat pavement. The 12V motor and parent remote make it a safer first step than a 6V car, though it is not built for rough ground.

How does it compare with a 24V ride-on?

It is smaller, slower and single-seat. A 24V two-seater carries more weight and handles grass better, but it is bigger, heavier and needs more supervision.

How long does the battery last and how long to charge?

Expect roughly 45 minutes to an hour of riding per charge, and several hours to recharge. Buy a second battery if long sessions matter.

Can parents control it?

Yes. The included remote lets a parent steer, start, stop and set speed, which is useful before a child is ready to drive alone.

What age and size is it for?

It suits roughly 3 to 7 year olds within the seat's weight limit. Check the listed maximum weight before buying, since taller children outgrow the low seat fast.