Apart from having an actual problem with one of the mics (a problem that got sorted out), all of my 3U Audio mics feel very sturdy and solid. Switches, threads, all work great. No mechanical issues or looseness. I have MKIDs, WARBLER 127s and TEAL CM-1s.
The cradle holders for the 127 are not the best (I assume they are a third party part and not in-house), but they do the work.