I've had them on various Harley's for years. A number of the motor officers here in the DFW area do too. They really need them considering that the pursuit lights replace our passing lamps.
I used the Custom Dynamics version of the motolights called Cool Magic. They are LED and only draw 3/4 of one amp and are super bright. They are on caliper mounts as well. I can tell you that motorists do notice me coming much better, I can tell by their actions at stop signs etc. Years ago the AMA did a study on lighting and referred to this as "three points of light" and acknowledged it does in fact greatly improve your visibility.