I have used it and then taken it off and replaced it for a simpler system. The link will take you to the page where I took it off and what I replaced it with. If you go back several pages you can find how it put it on. https://www.850gs.com/index.php/topic,596.msg7434.html#msg7434
For me it worked fine but didnít like certain aspects of its cheapness so replaced it with some thing just as cheep but much much more simpler which uses existing systems to do the work. It has been on for a while now and is set and forget. The only thing I havenít done is ride at night so havenít had to remember to switch it off but then thatís why I have a lit switch to remind me itís on at night.