Yep. We have the largest, latest, greatest version.
Would we buy it again? Nope.
It has lots of faults that updates and changes to settings can't fix. It has lots of 'extra' gizmos and calculations that we don't need or want. Yet it doesn't execute its basic function reliably--finding the shortest or fastest route from one place to another. At least half the time it tries to route us ways that would cost both miles and time.
And it does truly ignorant things, like trying to send us five miles past our exit only to have us do a u-turn and come back so that we get off the exit on the same side of the road as our destination.
And it often tries to send us over routes that are weight or height restricted. (I could go on but I think that's enough for you to know what I think of it.)
The nav system on the QC does a much better job of routing (as long as we're not running HazMat). We always program both and compare, and sometimes still check Google Maps before we roll.
It seems that a gps that touts itself as being for truckers should do a better job of the basics.