I have bought a module (Anti Patroon) from Error Instruments a year ago. About six months ago, I had a breakdown of the module. I wrote a mail to Error Instruments to ask how I could fix. The answer was to send it back in order to get it repaired by them and then returned back to me. So I sent it back. The result is that I never got back my module after something like a dozen mails to figure out what was happening with it.
Since then, no answer, no module back. I never thought this could happen in the modular community.