On the topic of Lazer helmets, and helmets in general... Do "urban" helmets offer more protection than "road" helmets, or just different styling? I'm going to be commuting by bike (about 7mi/rt) on roads where traffic can get a bit on the heavy side from time to time. If I'm going to be wearing a heavier helmet, I'd rather it protect my melon more than just look pretty..
An urban helmets tend to be hotter due to less and smaller ventilation holes, so your head will become very hot. However, I think MTB helmets are safer then road bike helmets due to the MTB helmets have a bit more coverage along the back of neck and they are designed to crash because MTB'ers crash more due to the nature of the sport. BMX helmets are designed even better because of the constant crashing those guys do, but ventilation is a problem again. I like the MTBing helmets the best, and modern designs have increased their ventilation to nearly the point of a road helmet.
Grant Pederson of Rivendell says to buy the cheapest helmet you can because they all have to meet the same federal crash requirement, I don't fully buy into that. The better helmets have a tad more safety features that will protect your head better then the federal requirements. My Lazer has a "roll cage" in the front half of the helmet to maintain the helmets shape to protect the head better then just the minimal federal requirement allows for. And other well designed...and more expensive helmets do the same like the top of the line Specialized helmet. But some expensive helmets like the Trek that cost around $125 was rated poor, so price isn't everything, but the Trek has no "roll cage" technology, while a cheap $50 Bell helmet was rated very good. However these rating came from Consumer Reports and I no longer have any faith in anything they report, so hard telling if what they said has any merit.
MTB helmets come with a visor, most are very long and would have to be removed in order to see while on drop bars; I like the Lazer's visor, it's very short and I can see fine in the drops.
Also if you do both MTBing and Road riding, by buying a MTB helmet you only need to buy one helmet, just remove the visor when riding the road bike if you find it interfering with your vision.