Works perfectly in my 2004 BMW 118d with a chinese android stereo.
Strange you have to wire the positive to the fuse box though, I would have thought it could get that from the existing loom and the 1 series fuse box is a nightmare to reach. If you need to know, the constant 12v fuses in the E87 1 series are: 2, 3, 7, 64, 68, 56.