The kids at work broke them quite easy with medium force squeezing
936239
Bag came opened and only had 4 balls in it.  The kids at work broke them quite easy with medium force squeezing.
1204757
I had plastic ones and they kept breaking with the kids, now I have metal ones and no breakage!
583798
They were cute and the kids loved them till they popped. All kids are rough with their toys and with one kids racing to the other kids with a giant ball in their hands something had to give and it was the balls. If your kids aren't rough with their toys them get these but if they are prepare for them to pop in one days time.
2335302
Broke after a week.  Not good for tough kids.
2240037
You can't expect much for the price, but my 4 year old daughter managed to break the eye-cup within about 5 minutes of holding it. (And she is pretty gentle with things)

Its not horrible, but you need to be extra gentle.
3814045
My kids ran through these so quickly. They break easily, so if you have elementary aged kids, spend a little more for good quality ones.
674056
I bought these to replace one of the Magic Tracks ones that came broken in my kids Christmas presents.  These worked fine, but easily broke.  My son accidentally kicked one as he was quickly walking through the room and it knocked the gears off track.  Then my 2 year old threw the other and broke the wheels off.  I never expect toys to last long at my house, but had hoped they would've lasted a little longer than the week we had them.
3844217
I liked it for the day I had it but my kids were able to break it just adjusting it
2934301
Kids complained they did not inflate easily. I never got to try, meaning a lot of the kids grabbed them from a prize box
4423919
My kids broke the handles off within minutes of opening this.  I gave it two stars because they are still usable and somewhat durable.
4034153
Not as durable as I thought they'd be, but still gave it 4 stars because I think my kids could break an anvil.
1464598
I was not expecting these to be perfect by no means. But they broke after an hour of my kids playing with the handcuffs.
2315428
These things burst in about 10 min - from two skinny little girls less than 7 years old!
1413626
They broke real easy. I was not happy with how easy they were to break *bend at the plastic and the metal part*
254331
When I got these for my 4 and 5 year old, the first thing my husband said was that he didn't think they would be able to use them because they rely on pump action.  They proved him wrong.  Even my 4 year old girly girl likes to give the pump action a try and shot the foam balls.  I actually like these better than the regular trigger nerf guns because the kids have to work on their coordination to use these, plus it's a mini workout for their little arms, haha.  They prefer the underhanded one with the foam balls to the overhanded one with the foam darts.  The reason I gave it 3 stars for durability is because the hinge piece on the foam ball gun keeps coming off whenever they try themseleves to reload the balls.  It snaps right back into place for me easy enough.  I have since advised them to only pull from one end and hopefully this will keep them from continously pulling the whole piece off.
4798709
You need to be careful when other kids are over playing. Our kids knew not to open, and damage them, but when other kids were here, some were damaged.
1522771
These were alright except for the fact when we were getting then ready and cracking them some of them broke..