i have been using it for a couple of months, they have been very helpful in solving a couple of issues and aside from some occassional missing 1min data the history seems fine.
however i will not use it for live trading again unless they fix the way they deal with dropped data connections. i had an incident in afternoon trading when the market was quiet, suddenly there was plenty of action and my system filled several orders, my partner watching on different data wondered why we were getting fills but to me it looked ok. we got creamed on all trades. then when we compared his charts to mine it was clear there were several minutes of made up data. after the close i downloaded the history and those same bars were missing.