LazyLunatic is running Qpeng on his 1.8T mk3 with it running rough it pulled something like 235BHP 
Just been speaking to a work colleague who has a lot of experience with MK4's, 20VT's, transplants and QPeng.. He says it's absolutely fine as a plug and play solution and when setup correctly it can be very good. He also mentioned that most people who say bad things about it haven't actually got any first hand experience with it.