I'm reviewing toys and after all my troubles with this gun I have given it 5 stars, mainly because they reduced the price, and it works great with Panasonic alkaline high drain batteries.
This is incredibly powerful and your 27 year old baby will love it.
For pre-teens, we have this dart gun which works just as well on regular (cheap) alkalines.
Some may prefer the darts because you can make your own and they still sting if you are hit. The golf balls are more powerful, but they roll under everything and you lose them. Also, they can give the gun away for free and just sell the balls. :)
If you have any trouble, just send them back. I don't have the greatest confidence in Hasbro's quality control.