I just fired up the Mindcrack pack to try it out. (Only started trying FTB last week, these are my first mods for Minecraft as well.) Upon creating a new world, I get slapped in the face with a message telling me that getting the same amount of metal I put into a recipe back out of the same recipe is an "exploit", and that the recipe has been altered. Worse, it's a message from a mod completely other than the one the recipe is for. Bronze is for Forestry, and apparently GregTech thinks that the "non-exploit" version of crafting Bronze is for half of my metal to vanish into thin air when I craft it. Four ingots in, two ingots out. To top it off, it appears (though I could be wrong) that the author of this mod is *insisting* that he will not add in an option in the config files to undo this change. I like the toys GregTech gives me. I was even starting to warm up to the added complications of some of the recipes from what I'd seen in Youtube videos, such as requiring Rolling Machines for mixed metal ingots, and Iridium for a lot of high end items. But to be arrogantly told that conservation of mass is an "exploit"? I don't like this. Not one bit.