MPEx is a scam, and this is one of his shells. The owner of MPEx has multiple aliases that he posts boosting his own image. The first post "Peter Lambert" posted on this thread, was a copy paste they have posted on other security threads before.
MPEx is being investigated by the SEC, and there is a fair chance the MPEx owner will be charged and extradited in the next year or so. Google it, there are a few articles about it. Not to mention the ridiculous 30 BTC fee, and a site that looks like its pre 2000.
Havelock is the best exchange, the NeoBee is a big loss, but you cannot put that solely on havelock. They have a great interface + fair fees. Personally, I like cryptostocks except for the amount of scams on it, use a good password + 2FA and your account should be good to go. I also like litecoininvest, but its LTC only at the moment.
Cheers