If you are riding 50+ miles on a ride, comfort and ventilation becomes king. This is a bargain.
All comes down to lower weight and increased ventilation
Comment It weight a lot less than a £40 helmet. It also meets the CPSC test standards. A large proportion of £40 lids cannot. EN1078 is a less aggressive test, but enough for sale in Europe.
It's a good deal but why pay so much when a helmet 1/4 of the price can do a job just as well? I'd never pay more than £40 for a helmet.