I use them for Wiffleball
I really use these plastic Wiffle balls for playing Wiffleball - you know, with a Wiffle bat. It's way more challenging than using the bigger Wiffle ball. My favorite Wiffleball activity is Home Run Derby. As far as how good they are for practicing your golf swing, they break way too frequently, though they are fairly durable. These Wiffle balls are highly recommended. When playing Wiffleball, they will carry pretty well, especially when the wind is blowing out. Have fun with them. Get the most out of them.
Unusable after a few swings
Their quality is pretty poor. I'm a beginner so I don't really have a strong swing yet, and even at half speed these balls lasted about 4 swings before they were dented to the point where they were unusable. I'm glad this product doesn't cost more.