Leatt DBX Neckbrace
Keeps you from breaking your neck, Adjustable,
May not work well with larger type helmets
I bought this brace after breaking my collar bone due to the chin guard of my helmet making contact with it. It thought some extra protection in general would be good. Along with it, I bought a new helmet that was a bit smaller than my previous. Once I set up the brace, it was very nice and with my 661 comp carbon helmet, I had plenty of range of motion while riding even the steepest trails. I have used it for several seasons it it has done well overall with the materials holding up.
While riding, it never really felt to get in the way while going down the trail. I did experiment with the extra strap and ended up riding without any extra retention as I could not really tell a difference while riding. It does come with multiple adjustment pieces to make sure it fits each rider regardless of size just right.
I feel like it has saved me, or at least did not hurt, on several pretty big wrecks that I have had over the past couple of years. I believe that this is not only for newer riders, but even experienced riders as well. You never know when you may take a spill and break your neck. Relatively cheap for what it could save you for the rest of your life.