I've had two USA 5 strings. A Marcus Miller and a USA standard. Neither were particularly brilliant. The construction was very poor, especially on the Marcus Miller which would have been really expensive when new.
They were string through, and had little metal cups on the back of the body for the string ball ends to fit in. These weren't fixed and would fall out. The neck pockets were both cut badly, they were too big and cut at an angle.
Sound wise the MM was the better of the two, the pre was actually quite nice.