The best review I have seen about the Connetix tiles is "Connetix is life".
Connetix Tiles are:
Open-ended toys not only help develop a child’s imagination and creativity, they also grow WITH the child. As they learn and develop, their play becomes more evolved. A simple ball run designed by a younger child might turn into a complicated creation involving more detailed engineering for an older child.
Quality: Connetix pride themselves on producing a quality product that will last through many years of play in homes around the world. Their tiles are made using non-toxic, ABS plastic that is BPA and Phthalate free. All tiles include ultrasonic welding and rivets for extra safety and their unique beveled design allows Connetix to be strong and more scratch resistant. Connetix is an Australian company manufactured in China and have taken the safety of their products very seriously. All the necessary testing and approvals required to sell Connetix worldwide have been undertaken.