The experimental 1.6 whatever had the first IC2 feature additions in forever besides several reactor revamps. Besides the reactors, the mod in 1.5 is pretty much exactly the same as it was in 1.1. And as far as gregtech goes, a lot of people (including me) dislike it.
i like what it adds i just dont like the mod makers interactions with other modders. now lets leave it at that and get back to the topic on hand.