Zilliqa pumped huge after its ICO and is still one of the few ICOs that is still trading at many times its ICO price. Should do well after mainnet launch.
Yes, it has given its investors huge ROI and is performing well even in a bear market. It shows alot of promises but the issue I have with most of these projects is that after their Mainnet release it seems most of the projects stop rallying in price, ICON, Wanchain, EOS, TRON just to name a few and with no one using the platform