It's true about the bosch platinums. I installed them in a 2000 alero, 3.4, and they lasted a little over a year. They are not compatible with most newer GM applications. I played it safe and replaced the bosch's with AC delco's. Made a world of difference.
Don't know if the E3's would be subjected to the same results. Not willing to take a chance as of now until some more results and feedback is established.