I finally got round to installing the PIAA 1100x driving lights this weekend and I have to say they look good. I used the EZ-Mount kit from Cyclgadgets which locates the lights under the fairing on small brackets that attach to the side panels. This means, however, that if you take the lower side panels off you have to deal with the lights which may be a little difficult - I will let you know.
For now I have run the wires down the right hand side of the bike and fastened them to the frame - running the cables from the lights back to meet them where the auxiliarry horn socket is. I have bought the Autoswitch but haven't got round to installing that yet so for now I have connected the lights to the battery direct and am using the supplied switch rather than the Autoswitch - maybe a project for a Sunday morning tinker in the garage!
There are a couple of potential problems with this installation. Firstly the lights can, apparently, interfere with the suspension and if you hit a pothole or curb too hard the lights will make contact with the front fender. Secondly once installed it is nearly impossible to adjyst them as one ofthe adjusting screws is behind the light up against the plastic side panel.
They do give a good light and hopefully will make the bike a little more visible which was the idea of installing them!