I received my Vortex PBT backlit key cap set the other day and to my dismay, the set was incomplete (missing "u" and "o" keys) and had a defective cap (can't tell what the letter was supposed to be).
Close up of defective cap: Disregard
I've been a long time customer and have bought quite a number of products from mehcanicalkeyboards.com (3 Ducky keyboards, many Cherry MX clear switches, etc) and the oversight on this is disappointing :<