We played with Jarts all the time. The only thing that ever got damaged were those cheap little roll out 2 foot deep swimming pools. They just happened to be sitting out in the area we were throwing the Jarts, and the next time you tried to fill up the pool you'd find a dozen holes in the hard plastic sides.
Weird thing is, reading up on them now, apparently they were banned in 1988 from the US, but I remember playing with what appeared to be new sets in 1996 or so.