A couple of years ago I tried E-Signal and my office was essentially 25 miles as the Crow flies from their headquarters.
I was suffering from SPX cash and futures quotes "freezing" consecutively on my Windows XP platform via broadband cable.
One quote would "freeze" about 5 minutes into trading, and then out of nowhere, the other quote would "freeze" a couple of minutes later. ( this was occurring during "normal" market conditions; not fast-market conditions ).
I must have spent 15 hours trying to troubleshoot this during a little over a week's time. The techs at E-Signal were not very helpful. Nice guys, but they were not able to fix the problem.
I spent an awful lot of time "diagnosing" this issue for THEM, but they were of no help.
Never again.