Better make sure your triggers are designed for set based logic and not row based updates. If the application only updates one row at a time, the trigger might very well only handle that. Bad coding, but I've seen it plenty and your mass update would produce unpredictable results in such a case.
You can't do that with ER. Two minute recap is all they offer. I found that out to my disgust this weekend when I went there to watch a show I missed because the local channels preempted the entire hour with Storm Coverage.