I also planned to invest in deepcoin, but I pay attention for trade platforms and trade volume for all the coins. Deeponion has serious low trade volume problem. I passed it simply.
They need to hit more trade volume to attract others.
DeepOnion did have quite low trading volume, but it's increasing substantially during the past two weeks (check coinmarketcap). Considering it's only on two mineor exchanges right now, the current daily trading volume of 6-12 BTC seems reasonably high. Also the community is growing rapidly, which gives DO a good backup.