There was one ride at night in the pouring rain when I couldn't see edge of the asphalt road with my helmet mounted 200L-AA-S, but otherwise the Dinotte has been great. If you want to mount the "light engine" on your helmet while the battery pack is in a jersey pocket, be sure to order the 200L with a long (42 inch) cord. Personally, I like having their battery pouch strapped on the back of my helmet (no more messing around with the cord and finding a pocket for the battery!).