An average gameplay in EE2: make a stone pick, make a divining rod, go diamond hunting, make a collector farm, done.
I felt it was overpowered, but it sure is better than having a world full of massive quarry holes you need to make to get all the resources for the stuff you want to make or build.
I feel Tekkit lacks a little in getting the resources in a balanced fashion, and tekkit lite lacks in getting resources without damaging the environment. (I'm referring to one of the first comments basically saying quarries are only used for EMC. If I'm wrong in doubting this, please feel free to correct)
However, that's just my opinion. I run a simple server for me and my friends, and the quarry holes tend to not look very nice, or cause lag because of the increased amount of loaded chunks.
Also, danidas, I didn't know you could make copper and tin with UU-matter?