I've used them (only to recover other people
), and they do their job. I'd rather they sat a little closer in, for better ground clearance, but I've never snagged them on anything...
One of the three holes that the hooks connect to on the WJ's frame isn't quite the right size (it's square, and a little too narrow for the Rusty's kit's bolt). I know it's not necessarily recommended, but I just run with the two bolts and it's plenty strong enough for pulling TJs and XJs out.
EDIT: I bent my brackets trying to pull a moderately built TJ off a log. Technically, since I was running only two bolts, I suppose it could be my fault, but looking at how the brackets bent, it doesn't look like the extra bolt would have helped; if anything, a thicker, or more reinforced bracket would have helped. I'm not going to change whether I recommend the product, because technically, I didn't install it correctly, but it's just something to think about before buying. Pics of the bent brackets in my build thread.