For what it's worth, my MiniBrute has not had any problems. Of course that doesn't mean it won't... the keybed problem seems to strike people at random and I have not opened mine up to look at the condition of the plastic holders.
I only say that to point out that not ALL are having problems, although it does seem like a bit of a gamble.
There is a tendency for forums to make problems seem much more prevalent or more common than they might be in reality, because most of the "happy customers" typically stay silent. So even if the faulty keyboard or other problems are only 2% of total produced units, on here it's gonna look like close to 100%.
It's still a great synth, but I suggest even if you are willing to take the risk of build quality and purchase one anyway, you should first spend some time on these forums to read about some other known problems and quirks (some of which should be fixed in firmware upgrades). Some of those problems might not mean anything to you, but some might be show-stoppers DEPENDING on how you intend to use the instrument.