Hyper is powerful but Hasbro are cheap bastards for leaving out 20% of the balls. The new material doesn't seem to work well in hoppers, with the rounds sticking together.
All the ball blasters are aimed at a teen audience at the moment, so you'd need to look at standard dart blasters for lower power. If you can find an X-Shot Turbo Advance (I think the Adventure Force version is the Superdrum?), that might be better for playing fetch? The Adventure Force Villainator is similar but hits a little hotter