i need to get a new helmet soon becuase the one i have now is basically falling apart and the main reason is that i took a good hit to the head with it. Now, i want to get a nice lite helmet like a shoei or an arai but i don't have the cash for them. I've seen a couple helmets on ebay that i like but some of them are used. As long as the helmet hasn't been damaged, is there anything bad about buying someone's used helmet? Should i worry about the padding breaking down from use?