As long as there's no slop, things line up, and nothing is seizing/locking up when it's in place I would run it. I feel like this is something you'll be able to tell pretty quickly whether it's working right or not, and it's an easy part to inspect for wear/play - just take the wheel off.

Any reason why you're not reusing your old ones with the ES bushings? They look to be in pretty solid shape - why not press in a new ball joint and call it a day?