I’ve built some Blue Brixx sets (Star Trek!) and the piece quality was great except for one or two bad molds out of a thousand or two pieces.

I’ve also built a gifted Pacific Rim Jaeger set from Amazon where the color came off on my hands in a really upsetting way. The pieces themselves were of ok quality except for the color.

My kid have bought some micro brick sets at touristy sites, and they aren’t great.