Johnny joint?

Looking at the currie front arms for my 91 xj. Just wondering how long the ball/bushings in these last for daily driving. I know for the rear end side on my chevelle they are NOT recommended for street use.Anybody use these with success on the street.I put about $10-15k miles a year.

They are pretty durable if you keep them greased. They are cheap to rebuild anyway. I have Four on my front end, zero wear so far.