Not to hijack the thread...and, I will provide my opinion regarding modular helmets in a moment...but, it seems to be more of a "Snell vs non-Snell" thing...so...NO MODULAR HELMET MEETS THE SNELL FRONTAL IMPACT TEST! There...now that that's been said...it bears saying, also, that the Snell Foundation is going to have to re-evaluate their criteria...not just every five years, as they do now to determine the new Snell rating standards, but relative to the future of their very existence.
Many factors are coming to bear on the Snell approval process...it used to be that every racing organization in this country required a Snell approved helmet to be a competitor...as many of you know, several sanctioning bodies in the US are now allowing ECE certified helmets to be used in competition...
This results in a larger selection of approved helmets...and, almost all of the ECE helmets are priced lower than Snell approved models...so, over the course of time, fewer Snell approved helmets will be purchased.
Add to this the production costs of Snell approved helmets...remember, now, they do not have to be used in competition (which has been one of the major selling features of a Snell approved helmet)...and the manufacturers of ECE approved helmets can make one production run of 25,000 helmets for the entire world...while Snell approved manufacturers will be forced to contemplate how many helmets to make for the dwindling demand for their product in one country...
Production runs to "fill in" sizes and colors they might run out of used to be 250-500 helmets at the minimum...in the coming years "fill in" runs will be closer to 1,000 helmets...that's twice as many helmets being constructed at a higher cost per helmet...raw materials, facilities use, transportation, and labor costs will demand it.
I know...Arai...and Shoei...say they will continue to make Snell approved helmets...in fact, that is ALL that Arai makes! But, look ahead and see what you think the market (demand) will be for their products in five years...
And, for any helmet manufacturer introducing new, higher-end helmets...which certification do you think they will pursue?
This is why I believe the Snell Memorial Foundation needs to re-evaluate who they are and what they do...their staunch stand on exclusivity is, seemingly, backing them into a corner with no way out...
As to the question of modular helmets...I do like the convenience of being able to flip the front up and walk into the gas station when the pump tells me to "See Cashier for Receipt"...I do like being able to keep the helmet on (and my ears warm) when I stop for a drink...some people like the convenience of being able to smoke with their helmet on...
Are they less rigid than a non-modular helmet, Snell or otherwise? Yes, I think they are...my thought is they have to be, since the shell is multiple pieces.
The down-side is weight and noise...
Are they unsafe? No, I don't think so...I have never heard of any injuries being attributed to a modular helmet...
Sorry if I wandered...moderators...feel free to nuke this post if needed.
End of rant.