Designed in the UK, built in the US. Custom built and reasonably priced. One of the men behind the Jet City line, Doug White, is the brains behind these. He's a solid guy and I wouldn't hesitate to buy anything from him.
Vid from FastRedPonyCar who I believe posts here, using a Jet City head and White Box 212 cab.
Build quality is supposed to be solid and the sound is great. I definitely want one.