We are not in serious potty training mode but Molly has shown a little interest so I bought her a seat goes on the big toilet. The biggest treat for her is getting to touch toilet paper and "wipe" herself. She also loves taking the seat off the toilet and using it as her personal chair in the bathroom when I am not watching. There has been no real action while sitting on it but there is no real loss, I figure once she has doubled her life she will for sure know how to use the bathroom. Also the benefit of a diaper while traveling - I don't have to stop when she needs to go so it is totally worth delaying serious training!!