DislikedDarkstar about MBT. The Esignal tape does not contain traded size.Ignored
I trade NFP on MBT and have never seen the spread at 10P. It has always been on par with other market quotes and much lower than the market makers. I know they shade larger orders, but every broker does.
We don't have access to the order books banks are looking at and never will, so, I'm not concerned with that. A market sampling is meaningful if it's properly scaled. ECNs including MBT are connected to enough larger institutions that their data, if not perfect, is representative to a degree.
My only suggestion is, rather than believe something or dismiss it based purely on another person's words, the best approach would be to test it yourself and form your own judgement. There seems to be as much disinformation as reliable information being floated about order flow data, so this seems the most sensible approach.
COT data, PA and VSA can be used to corroborate whether a brokers price orderflow data is reliable when the market hits an area where large order blocks are sitting.
(you can access live COT charts here http://www.timingcharts.com/)
I apologize, I can't comment intelligently on esignal bid ask size data until I get more information.