It's a question that everyone who will join this network need know the answer, thank for that.
What about the payment address, i think there is not a problem for example i used the deposit address on Poloniex, normal right ?
It's recommended not to use Poloniex for your wallet. Don't ask me why. Join the Rocket Chat at community.storj.io and ask in the channel #sjcx about it.
I'm pretty this is recommended because polo is an exchange and any coins you store on an exchange are technically "not yours". You don't hold the keys for that wallet and they are more susceptible to being lost. There might also be a more technical reason as well but I am not entirely sure about that.