I read a lot of bad info about sistemkoin but decided to test it out for myself.  Made a small BTC deposit and attempted to withdraw, that was over 2-weeks ago.  Contacted support and they said their developers are "working on the BTC wallet" and hence the delay.  Yeah right lol...  If it takes their developers 2+ weeks to fix their BTC wallet I wouldn't ever use this exchange for anything else anyhow!!  Complete SCAM site, stay away!!!