I agree with charsuewilson. Most frustrating are rulers that move. Why should we pay big money for a tool then have to pay more to modify it so it works right? And even after modification they don't work well for very long. Thank you, Creative Grids. They really did it right.
As for seam rippers, I love the Clover ripper that is white with a black band. The handle is large enough to hold onto, the black band is soft enough to help prevent slipping in the hand, and the tip is quite fine and sharp. Someday I really should throw away all the other seam rippers that I don't use.