Sand Mills

Way back in October, we purchased this set:

Okay, so not way back, only 5 months. We bought two sets of these. These are supposed to be able to be used in the sand and in the water. In my experience, they can all be used in the water; but sand doesn't work so well in the one in the middle not the one on the right. The one on the left seems to be the best one all around. Both of the middle sand mills have since broken. The lever in the middle has broken off, and it is really not very sturdy to begin with. The one on the right works in the water, but not at all in the sand. The best on is the one on the left. This one has proved to be the sturdiest and most flexible in use. If I had to do it all over again, I would just buy more of the ones on the left and leave the other two alone.