Not sure about the colorstar 3000. But I have used one of the jobo 5100's back when it was initially introduced. My estimation was that it wasn't worth the effort as it didn't get me any closer to a neutral print any faster than without it. In fact quite the contrary - it's just a thingamajiggy with blinking lights designed to take up space on your counter-top and fog your paper. This is probably why I've never heard of anyone who's good at making color prints using one of these things. Besides, your eyes are much more sensitive than a couple hundred dollar "color calibration" gizmo. Beware the magic bullet.
That was the same as my experience of using a colorstar 3000, more trouble than it was worth.
The management of a lab I was working at bought it and none of the printers working there bothered with it.