Inserting 4 Amperes of 32 EU-V into a 128 EU-V Machine will result in an Insufficient Energy Line (And EVERY Machine can have THAT now, even Steam ones once they are done!).
Then I think each machine should have a power-off switch, because it's really stupid that you have to pick up the cable or even pipe now to stop the machine. It makes much more sense to switch the machine of/unplug the wire from it than to destroy your whole cable.
Also bug time:
Trying to open creative tabs just freezes the game.
When you have NEI tooltips on and look at a machine, fps goes down a lot and memory usage starts increasing rapidly.
Searching in NEI takes more than 10 seconds (without GT there's no problem).
When you look at any Tiny Ore with NEI tooltips, the tooltip switches rapidly between Impure something, Tiny Ore, Crushed Something etc. (hard to read it at the speed it's flickering)