TC/TC integration is incredible. You can tell both parties went out of their way to make it work.You can track IC2 storage? How? I've been thinking of how to it and found my knowledge is lacking.
Regarding TC, I noticed that GT adds a few things. I usually don't explore the metal transmutations early for lack of aspects but I certainly will do so now. As a matter of interest, I think I can debug my golem farm by replacing the gatherer golem with EnderIO vacuum chests. The gatherer kept attempting to pick up the rare sapling that fell behind the fence until the other stuff despawned. I'm also going to use jungle trees as a source. They give more wood than dark oaks. They do have branches but as opposed to GT axes, the golem uses an Axe of the Stream which is capable of cutting down trees with branches. Implementation has to wait since there are RL obligations, grrr....
BTW, one thing I really don't like in GT picks, axes and shovels is that they're so limited in their use. I can shovel tons of dirt with a GT shovel but I can't break tall grass? Breaking dirt with a pickaxe may be inefficient but it should be possible.
With IC2 storage you can display the values via nuclear control on screens which is pretty cool. You can output redstone signals directly via its gui based on some conditions, or use BC gates+structurepipes to get a slightly better control. For instance I believe you can output signals based on 25% increments.
Oh, and yeah, the tools thing is annoying. GT tools really do only work on the one material they're good for, for balance reasons, but the downside is as you mentioned it. Very annoying.