the cheap helmets are probably fine and never have a problem
i'm just the type of person who is prepared to spend more for quality, especially when it comes to critical safety issues
as an example, my street bike helmet I got on sale for $600, my leather riding jacket i got on sale for $550 and my leather gloves I got for over $100.
I ride with a jacket, boots and gloves even on hot summer days - i won't ride my bike in a t-shirt and running shoes.
Besides racing motocross and supermoto, I still took the advanced motor safety foundation course and a couple of Danny Walkers american supercamp sessions
http://www.americansupercamp.com/
Call me overly cautious or whatever, but the way I look at it. If HF can sell something for $59 and allow for a 25% off coupon and still presumably make decent profit... let's say the helmet landed in the US is $30. Subtract the freight and the manufactured cost might be $20. Obviously the manfucturing plant is in business for a profit so $5 - $10 profit margin makes the true cost $10-$15
I just don't want to trust my eyes to a product that was manufactured, "engineered" and i use that term loosely and tested at $10-$15 per unit
but on the other hand... in comparison, those helmets have got to be better than the **** people used 40 years ago