This is my friend's most favorite toy, at least from what I can tell. He plays with it the most and for the longest. He received it during his first birthday party and got so excited that he immediately started building things out of it. The pieces are big, so they're easy for my son to pick them up, yet soft enough so even when he bangs them on himself (or me!), it doesn't hurt.
The pieces fit together like Legos. He loves stacking and then unstacking them. We have a game where we see how tall we can stack the pieces together before it all falls down. He lets out a big laugh when it falls and then immediately wants to stack it up again.
There's a wheelbase, which you can use to create cars and trucks. My husband builds very attractive vehicles and wheels it around the room for my son to watch. My son also likes just pushing and pulling the wheelbase by itself as well.
The pieces' colors are nice and bright.
Once we're done we put all the pieces back in the zipper bag. It has a handle so we've been able to easily bring it with us on trips. No matter how much my son pulls on the bag, it hasn't ripped.
I foresee my son playing with this toy for a long time.