Hi, i checked out the pics. Very innovative. It looks like fun, but i too would worry about the lack of back support and possibly a sore bum! I had a buggy board and it was great until DS started jumping off whenever he felt like. Once i had to leave the baby and shopping in the pram and chase after him as he was heading for the escalator! Then there were times he wanted to eat or nap and we had no where for him. So after much thought I went out to get a dbl pram and it's solved all my problems
This looks good for an older child. I think a toddler should have a harness if sitting that high.