I recently got a Tanzbär and feel somewhat differently.
It’s definitely not the most beautiful machine - I don’t think it’s ugly, but the interface isn’t inherently pleasing to look - but the build quality seems fine to me. It’s not as high end as the Tempest, for sure, but there’s nothing that really bothers me. All of the knobs work perfectly, nothing’s loose, etc. Maybe that wasn’t the case on yours? For the price I’d definitely prefer something a more solid, but I don’t get the sense it’s about to fall apart.
I don’t find the spacing of the knobs to be an impediment to tweaking either.
More importantly, I love how it sounds! Definitely in the classic Roland neighborhood, but I’m actually getting a good range out of the sounds. And the extra functionality (pattern length per drum, parameter locks) is great for me.
Totally respect your point of view, and sounds like you made the right decision to get rid of yours, but the Tanzbär is really working for me!