I had live account with some other brokers (I forgot the name sorry: finlis or finwarlist or something like this). And I had account with fxclub 7 or 10 years ago (probably, I forgot as well). And I realized that the data are different in Alpari, Neuimex (I had account with them also) and others. Different data. 1M TF especially.

Sadaloma tested Brainwashing EA and this EA is using iTrend indicator as a filter. This iTrend indicator is very sensitive and he mentioned that this indicator is having the different values for different brokers and EA opens sell in Alpari and did not open anything for IBFX and after that we really realized that problem. You may check the thread with the trades of this EA (this Brainwashing EA was developed within our forum).

But if I will buy data from esignal or from something I'm affraid that it will be the same: different. Not too much but still. For some good EAs it does not matter. And for some good trading systems it does not matter as well. But some good systems and EAs will not work in this condition (will produce the losses).

One example is TSD EA. I tested it during the about two month and was able to compare the trades with the other brokers and it was different (trades) on D1 timeframe for the different brokers. D1 timeframe!

There are several opinions about it:
- first opinion: good EA and good strategy will work in any condition and we do not need to take into account these different data;
- second opinion: we need to create the EA or trading system as simple as possible to neutralize these difficulties with the data;
- 3rd opinion: we do not care about;
- the 4th: backtesting is nothing because every broker has its own minutes data which can not be compare with the data of an other broker (different data), so we need to provide the forward test only.

and so on and so on.