Unless at a bike night where most others are respectful of others property, I carry it with me. Never once used the helmet lock.
Same here. You can then usually stack it on the seat with everything covered by the jacket to keep it cool or in case it rains.I run a 6' bicycle cable through the helmet's face opening, one sleeve of my jacket, a strap of my back protector and one leg of my pants, and lock it all to a wheel with a padlock.
It is, but think of it that way, you still lose whether the thief gets it or not.The nicer the helmet and/or the sketchier the parking spot, the more likely someone will decide they want your helmet and take it. People have had their helmets cut off the seat lock - which is doubly stupid: not only did the owner lose the helmet, but the thief had a basically useless helmet with no way to attach the chin strap.
Might pick myself up one of these. Not just for the helmet but as a general backpack.