correct.. the naked balljoint will wear faster than you think... and every time it does you need to get it realligned, so the joy of the lower price may well be eclipsed by the aggravation of having bought an inferior product
but it depends on how much you use the car and what your budget is.. i mean there is no point in getting a cool suspension gizmo if it means you cant put gas in the car..
i can really recommend mustangsplus by the way, and their suspension packages allong with the upper arm relocation kit ..(the relocation is THE most impressive mod you can do to a mustang... it changes the cambergain from positive to negative... and totally changes the front suspension characteristics from a mid 60ies so-so handling car, into a cornercarver...!)
.. will change your car into somthing you want to drive every day...