Coming from someone from NY this doesn't surprise me. Lots of distractions in NY. I doubt everyone ignores the horn though. Speaking for myself if I heard a strange loud noise while driving I think I might glance in the general direction of where I thought the noise was coming from.

For me another important issue in deciding which horn to buy is "foot print". The smaller the better. Unfortunately smaller doesn't usually translate over to "louder". Still all things considered the "Hornit" sounds like it could be a good compromise and be easier to work with. I might buy one just to screw around with but rarely do I find myself needing a horn. Than again if I ever decide to commute by bike to work or do a planned ride through a city environment I would love to have a horn. More added geek factor but I can deal with that.