I have put a lot of hours on my five LC+ steamers and they all perfect, and they are among the best smokers I have, too. Both of the UP GP7 diesels I have wobbled out of the box but adjusting the traction tires fixed that. However, both have a frozen - solidly locked - set of axles on one truck and I have been unable to figure out how to fix them.
I have ordered both the Camelback (expecting no problems) and the FA set plus a B unit (hoping for no problems), but I'm not buying any more GP7s until I know their problems are fixed.