I picked up a month or so ago a MAxx D MK12 with a Diablo MK11, the LBS I went too didn’t have the six pack in stock (thankfully) I was aware it was more money and brighter but after chatting to the guys who get on fine with the older Maxx D for over night races I picked it up. The Maxx D in its brightest mode is 3600 lumens and it def lights up the trails well enough for me to ride the local tech, jump spot as quick as I do in the day.
It came with a metal bar clamp which is hinged but not quick release, a rubber strip came with it which goes between it and the bar and I have had no issues with it moving and have hit 5ft drops and 30ft doubles in the dark with it in.
The Diablo came with the plastic helmet bracket, because my helmet has a go pro mount built in, I picked up the go pro mount and have had no issues with it, it grips the Diablo really well and if anything happens I use the provided lanyard to secure it to the helmet so wont lose it.