I've found this to be the case also and in addition the ER2 exhibits less noise than the ES. This makes it a good candidate for system trading.
I've been following an ER2 system alert service as a beta tester for several weeks...
I have been using prime-line for about six years in my futures and forex trading. I originally used their Market Wiz software to make my trading decisions but switched to their tradestation programs two years ago.
I'm very happy with the results. I use it for both day trading and for swing...