Invest that much you can afford to loose . I can find information about plexcoin in their website only. And don't know this is scam or legal. It is better to trade on poloniex or coinbase i think.
Plexcoin is now considered to be the next evolution of its predecessors, in many forums, they talk about Plexcoin as a currency that could be a market development and soon to be used by many. And participate in the future.