Purchased from Amazon in late April 2025. I have many mechanical keyboards, and I would occasionally use this one for a change of pace. However, I noticed last month that one vertical column of keys stopped responding (see photo). I could probably return or exchange it on Amazon, but frankly, it's a hassle, and it's been over six months since I bought it. So, I've decided to list it as a "defective" item. I'd be happy if someone knowledgeable about mechanical keyboards, who can, for example, replace the PCB, would purchase it!