We kitted ourselves out with helmets from Lidl - about 12 notes for the adult ones. I can testify that they hold the appropriate standards and I took a couple of whacks on the head (took a whack off a sharp bit of a chairlift and landed on my head whilst trying to perfect my off piste technique!) without any adverse effects.
Sam, would be adviseable but depends on the severity and how fast you were travelling. I would say Yes to change it (I'm a qualified Motorcycle training instructor and also work for the ambulance sevice) but there are different things to consider. If you actually land on your head or bang it off something hard then i would change it but if just snow then maybe not. Ski helmets are light therefore by just dropping them you are unlikely to damage the polystyrene that is inside unless it's ...
Sam, would be adviseable but depends on the severity and how fast you were travelling. I would say Yes to change it (I'm a qualified Motorcycle training instructor and also work for the ambulance sevice) but there are different things to consider. If you actually land on your head or bang it off something hard then i would change it but if just snow then maybe not. Ski helmets are light therefore by just dropping them you are unlikely to damage the polystyrene that is inside unless it's direct on to concrete.