i think the ICO is not yet released in the market and myetherwallet is support with many ERC20 tokens so its like temporary wallet before the ico is launch. beside that, today most ico is using ethereum base so i guess only myetherwallet that could save the tokens and so far, that site is safe and good for keep the tokens. and like the others, you need to save your private keys in safe place because you responsible with your own tokens and when the ico is launch, make sure you have gas to send the tokens to the market.