A few notes on the Giro Switchblade downhill MTB helmet, which I now use most of the time when out on the e-boards. In summary, I really like it, have no issues with it and very happy to recommend it.
Graphics/colors scheme (my Red and White).
Detachable chin guard (the Parachute does not detach).
Half-shell having more coverage (over some of the others).
They all fitted well, which surprised me, and they all had the MIPS safety system, so my choice was really about just color, style, and cost. The cost new, after a bit of hunting around, was £160; which I was pleased with. I could not find discounted deals on the Foxes or the Bell DH, but the 3r Super and Met Parachute were available with deals at roughly the same price.
The Switchblade with chin-guard weighs 985g, which is a bit heavier than the very-light Met Parachute at 700g (but it has no metal chin lock mechanism, as the guard is not removable), but not an issue for me – I am used to much heavier motorcycle helmets. The foam padding is excellent and really comfortable. It has the RocLoc® Air DH system, where you just twist the wheel at the back of the head, to tighten or loosen the fit.
What, however, does differentiate some of the helmets with removable chin-guards is what kind of half-shell is left when the chin-guard is removed. This is very noticeable between the Bell Super 3r and the Switchblade, with the Giro having more jaw-side cover/protection when used without the chin-guard. Not that one is better than the other, it is really just a preference thing.