Like other Planet Dog toys, this ball is good, but not the best.  The knot in the rope comes undone quickly, so you will have to tie it again.  Also, if you have a constant chewer/mouther on balls (and don't just use it for fetching), the outer shell of the ball can come apart off of the inner shell that has the continents on it.  But that is usually after lots and lots of chewing.  Other than that, my dogs LOVE these balls.  They love the softness and the chewability.