This is my first tracker. So I'm assuming that any defects are user defects, not gear defects. I have used the NOMAD four times.
Two of them were very successful. I took a picture of Andromeda. Tracking over 80 and 60 minutes.
Two of them, were a total flop. The first time, I tried to understand how it all worked. The second time (although it was the third time), I could not get an accurate polar alignment. I noticed that the difference between the direction determined by the laser and by the polar scope was significant. Depending on how you screw it in, how precisely you place it in the hole.... Everything matters though. That's why (before the next time) in the daytime I set the polar scope so that the laser points in the center of its dial. I had to use a bit of tape to do this, because the slack on the mount is significant and if you misplace the polar scope, it can point in any direction (within a few degrees). I don't know if this is how I should set the polar scope, but only then, after an hour of tracking, the polar star was where it should be (regarding the information from the app at the beginning and end of this period). So the tracker is working correctly.
I am using not very heavy equipment. About 1.8 kg in total. Focal length 200 mm. Unfortunately, I have not yet been able to increase the focal length for times of about a minute of exposure. At 200 mm 1 minute works ok, but I will keep trying. Only dark skies I need.