Yes, well worth it, IMO. Just did one with Hampshire Police for £75. Top blokes, all genuinely concerned that bikers should hone their road riding skills to be safer. I would recommend most people to consider it. From my point of view, as I'm doing a RoSPA Advanced Riding course as well, it was a useful reference point on where my skills are deficient right now. Throw some track days in as well (e.g.: UKMOC!!) and I'm hoping it will help me towards a good balance of abilities. That is my plan, so it is.
