MBR10 OUT OF 10
The Super DH takes the removable wrap-around chinbar to a whole new level of protection. Granted, the weight has crept up by over 150g, but the DH version feels so much sturdier for it; something that's reflected in the ASTM 1952 DH safety rating.
It fits better too, thanks in part to the integrated MIPS spherical desigin. Its real strength though, is the outstanding level of ventilation. With 19 vents it keeps your head cool even as temperatures rise, and you never feel cocooned like you do wth a regular full-face helmet.
Fitting the chinbar to the Super DH is a little tricky compared to, say, a Giro Switchblade, and if you're doing it mid-ride, it's handy to have a friend check to see if the small hooks at the front of the helmet are actually located correctly.
One really neat feature on the Super DH is the new camera mount. You need to make sure the spring-loaded catch snaps into place, but once in, it's very secure. It has a breakaway feature too, which has already saved us and our GoPro from getting clotheslined by a low hanging branch.
The whole point of a full-face lid with a removal chinbar is to give you the best of both worlds in a single helmet: DH protection for enduro racing or bike park laps, and a well-vented open face for regular pedal rides. Bell delivers on both counts with the Super DH. Yes, its a little tricky to fit the chinbar with the helmet on, but as two-in-one options go, it's the best we've tested. It's very well vented and given its BMX and Downhill safety certifications its relatively lightweight.