After potty training 4, I do not use or like them AT ALL!
Heres my thought:
1. If you train them to use a potty chair wyou will have to re train them to use the toilet.
2. If you are in public or soemone elses house, are you going to bring it with you?
SO what I did was, I bout the toilet seat insert ($6-$12) to se at home and bought one that folds up for outings so my kids always used the big potty. I really like the protable insetrt bc it covers much of the toilet seat..which youknow they ALWAYS up thier hands on to hold themselves up!
I think its just so much easier this way!