Im still using an original Hope 4 as my only light I got in 2008 not long after they first came out and it
s been great. Plenty of light for me. Have always mounted mine on the bars without any problems. Don`t know about the new ones but mines a bit too heavy for helmet mount. Have recently bought one of those cheap led torches from Aldi I could use for that.
It has stopped working twice in that time though. Unsuprising given the use it gets all through the winter.
Hope fixed it foc within a week so no complaints.