I had originally changed out my OE coils for Jegs coils when I did my injector replacement. Subsequently I changed out the Jegs coils, after 3 yrs, for GM coils. The GM coils have been in there for about 32k miles and seem to be just fine. I didn't see any evident difference between the two brands by looking at my plugs, AC 41-602's, which I change every year.
The reason for going back to the GM coils was that they are specifically for an LT5, or so GM says; where the Jegs coils had other applications besides an LT5. I figure the environment in the valley of an LT5, for the coils, is fairly harsh temperature wise.
Tom