Mojoe, I wasn't trying to start an argument, I'm just stating that I don't get where the blind spot thing comes into play. If I put on my helmet and look behind me I can see everything that I need to be able to see with it on. That is on my bike anyway.
EDIT: There will be spots you can't see with helmet on that you could see without one on, but are they spots that you need to be able to see while on the road. I've found that the spots that are blocked I don't need to be able to see to safely maneuver on the roads. I've only had one helmet though as well so I guess this is biased.