Got the model 608 modular helmet on Tuesday. It looks nice.
Unfortunately, I won't be able to evaluate its comfort, because, like the 810, this "XXL" size is too small for me, despite being on the "low end" of the XXL sizes for other helmet manufacturers. The small "manual" that comes with the 608 calls the chin bar a "mouth holder", and that's exactly what it is, for me. I will see if someone else can fit into it.
The helmet is VERY well padded, though; it would appear that it could provide good protection, if you can fit into it. Definitely for "round" heads, though, without protruding jaw lines.
The latching mechanism is rather simple - two retractable plastic bars going into slots. They do not both reliably engage if the helmet is not ON a head, but, they would resist a side blow disengaging them, because they slide into a "box". The pivot for the hinge is metal, with a plastic bushing controlling the limits of "swing" for the chin bar and visor. The visor can swing up further than the chin bar, so it is possible to pull the chin bar down without the visor following it.
Edit:
I have spent some time over the past few days actually wearing this helmet while riding. Yes, I can fit in it, but, as I said, the chin bar rides against my chin. It is not padded, as such, but the part that contacts the jaw is covered in a moderately-soft rubber "plate". It looks like solid plastic, but it does flex quite well. But you don't want to wear this without shaving...
If the chin bar is up, this helmet does fit me "OK". But it is noisy, bar up OR down. The cut-outs in the padding for the ears are about 1/4" below where my ears actually start, which is a minor (for short rides) irritation, much less than the chin bar.
The skirt around the bottom of the helmet has some surprising gaps... it lets (cold) wind up into the helmet right at the ear area, which is a contributing factor to the noise level. But, it isn't the only factor. The edges of the chin bar and the visor generate significant turbulence, which equals noise. (note: remember to wear ear plugs)
Which brings up a positive factor - the thick padding means there is LOTS of space for earplugs. If V-CAN (the brand name on the helmet) uses this same shell for their smaller helmets, there's got to be a large cavern there... Big enough for some proper helmet speakers, maybe.