Tradeogre seems to go offline periodically.  It is offline right now in fact.  This might be due to DDOS attacks rather than site maintenance as there is no message when you try to load their site.  Also some people have expressed worry that there is no information about who runs it and no means to contact support or open a ticket, only a twitter handle.  Of the three exchanges it is the only one that was not endorsed by the developers, and of the problems with stocks.exchange specifically, sometimes the developers have intervened to try and resolve problems.  I personally would be leery of using Tradeogre for these reasons (though I have not used any of these exchanges).