Masters Foam golf balls

I really enjoy using Masters foams golf balls, you can hit them as hard as you want and they'll go next to nowhere so they're great for practicing your swing. Being deprived of the satisfaction of hitting a good shot can get frustrating but you can get an idea how you've struck the ball. If you slice or fade a shot they curve off as with a normal shot so its possible to improve your swing. With those gadgets where you hit a ball and it spins round although you get more feel its still pretty poor because they're made out of plastic and it's very difficult to tell what kind of flight the ball would've had.

In summary, they're cheap and useful, oh and you'll never manage to break a window with them either :-)!