I can't use it to shear the sheep with right-clicking the sheep. Oops. 
It's fine to cut the tree like an axe, get grass and vines with left-click, but nothing happen with right-click. 
The damage on mob is doing right, but... it's quite a headache to shear the sheep without killing them (with non-functioning right-click).
Any suggestion?
Edit: Sorry, I just saw someone had mention it on the second page...
IC2 1.1.06
Forge 4.1.2.265