We have had this toy for at least three years now, three years and TONS of play. Sometimes it will stay out for days on end, the kids just keep playing with it. I have found ALL Discovery Toys to be well made (and I have more than a few). Unfortunately pieces have been thrown, but there is not one broken or chipped piece in the set. We also have an add-on set. I love that the kids get to make up their own tracks and designs (we have also copied the pictures on the box), it gets their mind going and thinking. My kids are now 5 and 8, and need little help from me (but my husband and I both like to play with it, because it is so fun!). Of course the marbles are small, so it is a choking hazard to little ones, so now that we have babies again we take this toy out at nap time, or in a room the babies do not go into. I would recommend this product to anyone. We have purchased marbles from many different places and most are compatible. Some are a little big, but you just give them a little nudge and they make it through. My children's favorite thing is to make, "traffic jams", just keep sending marbles through until they are all backed up, and then let them all loose. :)