May I ask what the problem with the unit was? The only potential problem I see is with the disconnected IC pin, but even then that could be nothing. Soldering lumps are not a big deal if they aren't anywhere near something they could short out, or if they are not hanging off the board. I can't believe they would ever fall off from the unit's vibrations. The power shunt is a non-issue, in my experience with electronics I have often needed pliers to pull those things out, so I really don't think the sub could rattle those loose. And those pics are obviously of a ULS amp, anyone could see that from comparing the ULS rear panel with the placement of the XLR input jacks in your pics.
I think you are jumping to conclusions on QC issues, and as a ULS owner I can attest to it's high quality. If anything could have rattled loose internally, believe me, as hard as I push these things that would have happened to my units by now. These things are rock solid. I don't think your complaints against the ULS amp are as serious as you make them out to be, and they are not indicative of a low quality amp build like you claim. Maybe the soldering could be cleaner, but it doesn't make a functional difference, only an aesthetic one, and since the back panel isn't made of glass, it hardly matters. Hopefully your post won't discourage anyone who considering a ULS from buying one but it probably will, which is a shame. There is no sub doing what it does better at it's price point, and especially it's current sale price.