Does anyone have recommendations for a potty trainer? I saw these at Mothercare - anyone tried them and have a view?

For me, I used traditional potty which costs $2 to be used at home. It is very economical and easier to clean compared to those fanciful designs. After use the potty for about 2 months, I slowly transit my kids to toilet seat. When we are shopping or traveling, we will just hold our kids at toilet bowl for them to pee/poo. The 2in1 Potette Plus I was actually considered to buy it but I feel it is too bulky for us to bring around with us.